a Write down the coordinates of the point on the curve where t = 2. b Find the value of t at the point on the curve with coordinates ( 5 4, 8).
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1 Worksheet A 1 A curve is given by the parametric equations x = t + 1, y = 4 t. a Write down the coordinates of the point on the curve where t =. b Find the value of t at the point on the curve with coordinates ( 5 4, 8). A curve is given by the parametric equations x = 1 + sin t, y = cos t, 0 t < π. a Write down the coordinates of the point on the curve where t = π. b Find the value of t at the point on the curve with coordinates ( 3, 3 ). 3 Find a cartesian equation for each curve, given its parametric equations. a x = 3t, y = t b x = t, y = 1 t c x = t 3, y = t d x = 1 t, y = 4 t e x = t 1, y = t 4 A curve has parametric equations x = t + 1, y = t. a Find a cartesian equation for the curve. b Hence, sketch the curve. f x = 1, y = 1 t 1 t 5 Find a cartesian equation for each curve, given its parametric equations. a x = cos θ, y = sin θ b x = sin θ, y = cos θ c x = 3 + cos θ, y = 1 + sin θ d x = sec θ, y = 4 tan θ e x = sin θ, y = sin θ f x = cos θ, y = tan θ 6 A circle has parametric equations x = cos θ, y = sin θ, 0 θ < π. a Find a cartesian equation for the circle. b Write down the coordinates of the centre and the radius of the circle. c Sketch the circle and label the points on the circle where θ takes each of the following values: 0, π 4, π, 3π 4, π, 5π 4, 3π, 7π 4. 7 Write down parametric equations for a circle a centre (0, 0), radius 5, b centre (6, 1), radius, c centre (a, b), radius r, where a, b and r are constants and r > 0. 8 For each curve given by parametric equations, find a cartesian equation and hence, sketch the curve, showing the coordinates of any points where it meets the coordinate axes. a x = t, y = 4t(t 1) c x = t 3, y = 4 t b x = 1 sin θ, y = cos θ, 0 θ < π d x = t + 1, y = t
2 Worksheet B 1 A curve is given by the parametric equations x = + t, y = t 1. a Write down expressions for d x and d y dt dt. b Hence, show that d y dx = t. Find and simplify an expression for d y in terms of the parameter t in each case. dx a x = t, y = 3t b x = t 1, y = t 3 + t c x = sin t, y = 6 cos t d x = 3t 1, y = 1 t e x = cos t, y = sin t f x = e t + 1, y = e t 1 g x = sin t, y = cos 3 t h x = 3 sec t, y = 5 tan t i x = 1 1, y = t + t 1 t 3 Find, in the form y = mx + c, an equation for the tangent to the given curve at the point with the given value of the parameter t. a x = t 3, y = 3t, t = 1 b x = 1 t, y = t t, t = c x = sin t, y = 1 4 cos t, t = π 3 4 Show that the normal to the curve with parametric equations x = sec θ, y = tan θ, 0 θ < π, at the point where θ = π, has the equation 3 3 x + 4y = A curve is given by the parametric equations x = 1, y = 1. t t + d x = ln (4 t), y = t 5, t = 3 dx = t. t + b Find an equation for the normal to the curve at the point where t =, giving your answer in the form ax + by + c = 0, where a, b and c are integers. 6 A curve has parametric equations x = sin t, y = sin t, 0 t < π. dx = 1 tan t. b Find an equation for the tangent to the curve at the point where t = π 6. 7 A curve has parametric equations x = 3 cos θ, y = 4 sin θ, 0 θ < π. a Show that the tangent to the curve at the point (3 cos α, 4 sin α) has the equation 3y sin α + 4x cos α = 1. 3 b Hence find an equation for the tangent to the curve at the point (, 3 ).
3 Worksheet B continued 8 A curve is given by the parametric equations x = t, y = t(t ), t 0. a Find the coordinates of any points where the curve meets the coordinate axes. b Find d y in terms of x dx i by first finding d y in terms of t, dx ii by first finding a cartesian equation for the curve. 9 y O x The diagram shows the ellipse with parametric equations x = 1 cos θ, y = 3 sin θ, 0 θ < π. in terms of θ. dx b Find the coordinates of the points where the tangent to the curve is i parallel to the x-axis, ii parallel to the y-axis. 10 A curve is given by the parametric equations x = sin θ, y = sin θ, 0 θ π. a Find the coordinates of any points where the curve meets the coordinate axes. b Find an equation for the tangent to the curve that is parallel to the x-axis. c Find a cartesian equation for the curve in the form y = f(x). 11 A curve has parametric equations x = sin t, y = tan t, π < t < π. a Show that the tangent to the curve at the point where t = π passes through the origin. 4 b Find a cartesian equation for the curve in the form y = f(x). 1 A curve is given by the parametric equations x = t + 1 t, y = t 1 t, t 0. a Find an equation for the tangent to the curve at the point P where t = 3. b Show that the tangent to the curve at P does not meet the curve again. c Show that the cartesian equation of the curve can be written in the form x y = k, where k is a constant to be found.
4 Worksheet C 1 Differentiate with respect to x a 4y b y 3 c sin y d 3e y Find d y dx in terms of x and y in each case. a x + y = b x y + y = 0 c y 4 = x 6x + d x + y + 3x 4y = 9 e x y + x + 3y 4 = 0 f sin x + cos y = 0 g e 3x + e y + 7 = 0 h tan x + cosec y = 1 i ln (x ) = ln (y + 1) 3 Differentiate with respect to x a xy b x y 3 c sin x tan y d (x y) 3 4 Find d y dx in terms of x and y in each case. a x y = b x + 3xy y = 0 c 4x xy + 3y = 8 d cos x sec 3y + 1 = 0 e y = (x + y) f xe y y = 5 g xy x 3 y = 0 h y + x ln y = 3 i x sin y + x cos y = 1 5 Find an equation for the tangent to each curve at the given point on the curve. a x + y 3y = 0, (, 1) b x xy + y = 8, (3, 5) c 4 sin y sec x = 0, ( π 3, π 6 ) d tan x cos y = 1, ( π 4, π 3 ) 6 A curve has the equation x + y x + 4y = 6. dx = 1 x. 4( y + 1) b Find an equation for the normal to the curve at the point (1, 3). 7 A curve has the equation x + 4xy 3y = 36. a Find an equation for the tangent to the curve at the point P (4, ). Given that the tangent to the curve at the point Q on the curve is parallel to the tangent at P, b find the coordinates of Q. 8 A curve has the equation y = a x, where a is a positive constant. By first taking logarithms, find an expression for d y in terms of a and x. dx 9 Differentiate with respect to x a 3 x b 6 x c 5 1 x d x3 10 A biological culture is growing exponentially such that the number of bacteria present, N, at time t minutes is given by N = 800 (1.04) t. Find the rate at which the number of bacteria is increasing when there are 4000 bacteria present.
5 Worksheet D 1 Given that y = x + 3x + 5, and that x = (t 4) 3, a find expressions for i dy in terms of x, dx dx dt in terms of t, b find the value of d y dt when i t = 5, ii x = 8. The variables x and y are related by the equation y = x x 3. Given that x is increasing at the rate of 0.3 units per second when x = 6, find the rate at which y is increasing at this instant. 3 The radius of a circle is increasing at a constant rate of 0. cm s 1. a Show that the perimeter of the circle is increasing at the rate of 0.4π cm s 1. b Find the rate at which the area of the circle is increasing when the radius is 10 cm. c Find the radius of the circle when its area is increasing at the rate of 0 cm s 1. 4 The area of a circle is decreasing at a constant rate of 0.5 cm s 1. a Find the rate at which the radius of the circle is decreasing when the radius is 8 cm. b Find the rate at which the perimeter of the circle is decreasing when the radius is 8 cm. 5 The volume of a cube is increasing at a constant rate of 3.5 cm 3 s 1. Find 6 a the rate at which the length of one side of the cube is increasing when the volume is 00 cm 3, b the volume of the cube when the length of one side is increasing at the rate of mm s h cm The diagram shows the cross-section of a right-circular paper cone being used as a filter funnel. The volume of liquid in the funnel is V cm 3 when the depth of the liquid is h cm. Given that the angle between the sides of the funnel in the cross-section is 60 as shown, a show that V = 1 9 πh3. Given also that at time t seconds after liquid is put in the funnel V = 600e t, b show that after two minutes, the depth of liquid in the funnel is approximately 11.7 cm, c find the rate at which the depth of liquid is decreasing after two minutes.
6 Worksheet E 1 A curve has the equation Find an expression for d y dx 3x + xy y + 9 = 0. A curve has parametric equations where a is a positive constant. in terms of x and y. (5) x = a cos θ, y = a(sin θ θ ), 0 θ < π, dx = tan θ. (5) b Find, in terms of a, an equation for the tangent to the curve at the point where it crosses the y-axis. (3) 3 y O x The diagram shows the curve with parametric equations x = cos θ, y = 1 sin θ, 0 θ < π. in terms of θ. (3) dx b Find the two values of θ for which the curve passes through the origin. () c Show that the two tangents to the curve at the origin are perpendicular to each other. () d Find a cartesian equation for the curve. (4) 4 A curve has the equation x 4xy + y = 4. dx x y x y (4) b Find an equation for the tangent to the curve at the point P (, 10). (3) The tangent to the curve at Q is parallel to the tangent at P. c Find the coordinates of Q. (4) 5 A curve is given by the parametric equations x = t +, y = t(t 1). a Find the coordinates of any points on the curve where the tangent to the curve is parallel to the x-axis. b Show that the tangent to the curve at the point (3, ) has the equation 3x y = 5. (5) (5)
7 Worksheet E continued 6 Find an equation for the normal to the curve with equation x 3 3x + xy y + 3 = 0 at the point (1, 1). Give your answer in the form y = mx + c. (7) 7 h cm The diagram shows the cross-section of a vase. The volume of water in the vase, V cm 3, when the depth of water in the vase is h cm is given by V = 40π(e 0.1h 1). The vase is initially empty and water is poured into it at a constant rate of 80 cm 3 s 1. Find the rate at which the depth of water in the vase is increasing a when h = 4, b after 5 seconds of pouring water in. (4) 8 A curve is given by the parametric equations t x =, y = t, t ± t 1 t dx = 1+ t. (4) 1 t b Show that the normal to the curve at the point P, where t = 1, has the equation 3x + 7y = 8. (4) The normal to the curve at P meets the curve again at the point Q. c Find the exact value of the parameter t at Q. (4) 9 A curve has the equation x + x y y = 0. Find the coordinates of the point on the curve where the tangent is parallel to the x-axis. (8) 10 A curve has parametric equations where a is a positive constant. x = a sec θ, y = a tan θ, π θ < π, dx b Show that the normal to the curve at the point where θ = π 4 in terms of θ. (3) has the equation x + y = 5 a. (4) c Find a cartesian equation for the curve in the form y = f(x). (3) (5)
8 Worksheet F 1 A curve has parametric equations x = t, y =. t in terms of t. (3) dx b Find an equation for the normal to the curve at the point where t =, giving your answer in the form y = mx + c. (3) A curve has the equation y = 4 x. Show that the tangent to the curve at the point where x = 1 has the equation 3 A curve has parametric equations y = 4 + 8(x 1) ln. (4) x = sec θ, y = cos θ, 0 θ < π. dx = 4 cos3 θ. (4) b Show that the tangent to the curve at the point where θ = π has the equation 6 3 3x + y = k, where k is an integer to be found. (4) 4 A curve has the equation x + 6xy y + 77 = 0 and passes through the point P (, 5). a Show that the normal to the curve at P has the equation x + y + 3 = 0. (6) b Find the x-coordinate of the point where the normal to the curve at P intersects the curve again. 5 y (3) O x The diagram shows the curve with parametric equations x = θ sin θ, y = cos θ, 0 θ π. a Find the exact coordinates of the points where the curve crosses the x-axis. (3) b Show that d y dx = cot θ. (5) c Find the exact coordinates of the point on the curve where the tangent to the curve is parallel to the x-axis. ()
9 Worksheet F continued 6 A curve has parametric equations x = sin θ, y = sec θ, π < θ < π. The point P on the curve has x-coordinate 1. a Write down the value of the parameter θ at P. (1) b Show that the tangent to the curve at P has the equation 16x 9y + 4 = 0. (6) c Find a cartesian equation for the curve. () 7 A curve has the equation sin x tan y = 0. dx = cos x cos y. (4) b Find an equation for the tangent to the curve at the point ( π 3, π ), giving your answer 6 in the form ax + by + c = 0. (3) 8 y O x A particle moves on the ellipse shown in the diagram such that at time t its coordinates are given by x = 4 cos t, y = 3 sin t, t 0. in terms of t. (3) dx b Show that at time t, the tangent to the path of the particle has the equation 3x cos t + 4y sin t = 1. (3) c Find a cartesian equation for the path of the particle. (3) 9 The curve with parametric equations t x =, y = t, t + 1 t 1 passes through the origin, O. dx = t + 1. (4) t 1 b Find an equation for the normal to the curve at O. () c Find the coordinates of the point where the normal to the curve at O meets the curve again. d Show that the cartesian equation of the curve can be written in the form y = x 1 x. (4) (4)
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