Mathematics, Algebra, and Geometry
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1 Mathematics, Algebra, and Geometry by Satya Contents 1 Algebra Logarithms Complex numbers Quadratic equations Sequences and series Factorials and Probability Trigonometry 4 3 Trigonometric identities Angular relations Sine-Cosine-Tangent Combos Halving angles More angular trigonometric relations Trigonometric Rules Inverse trigonometric relations Coordinate geometry Triangles Straight lines Line pairs Mensuration Solids Plane figures Numerical Methods 9 1 Algebra 1. (a + b) = a + ab + b ; a + b = (a + b) ab. (a b) = a ab + b ; a + b = (a b) + ab 3. (a + b + c) = a + b + c + (ab + bc + ca) 4. (a + b) 3 = a 3 + b 3 + 3ab(a + b) ; a 3 + b 3 = (a + b) 3 3ab(a + b) Math formulæ by Satya 007/10/08 Page 1
2 5. (a b) 3 = a 3 b 3 3ab(a b) ; a 3 b 3 = (a b) 3 + 3ab(a b) 6. a b = (a + b)(a b) 7. a 3 b 3 = (a b)(a + ab + b ) 8. a 3 + b 3 = (a + b)(a ab + b ) 9. a n b n = (a b)(a (n 1) + a (n ) b + a (n 3) + b b (n 1) ) where n N 10. a m.a n = a m+n where m, n Q, a R a m n if m > n 11. a m a n = 1 if m = n 1 a n m if m < n; m, n Q, a R, a 0 1. (a m ) n = a mn = (a n ) m ; m, n Q, a R 13. (ab) n = a n b n where a, b R, n Q 14. ( a b )n = an b n where a, b R, n Q 15. a 0 = 1 where a R, a a n = 1 a n, a n = 1 a n where a R, a 0, n Q 17. a p/q = q a p where a R, a > 0, p, q N 18. If a m = a n where a R, a ±1, a 0, then m = n 19. If a n = b n where n 0, then a = ±b 0. If a, x, y Q and x, y are quadratic surds and if a + x = y, then a = 0 and x = y 1. If a, b, x, y Q and x, y are quadratic surds and if a + x = b + y, then a = b and x = y 1.1 Logarithms. log a mn = log a m + log a n where a, m, n are positive real numbers and a 1, 3. log a ( m n ) = log am log a n where a, m, n are positive real numbers, a 1, 4. log a m n = n log a m where a and m are positive real numbers, a 1, n R 5. log b a = log k a log k b where a, b, k are positive real numbers, b 1, k 1 6. log b a = 1 log a b where a, b are positive real numbers, a 1, b 1 7. If a, m, n are positive real numbers, a 1, and if log a m = log a n, then m = n 1. Complex numbers 8. If a + ib = 0 where a, b R and i = 1, then a = b = 0 9. If a + ib = x + iy where a, b, x, y R, i = 1, then a = x and b = y Math formulæ by Satya 007/10/08 Page
3 1.3 Quadratic equations 30. The roots of the quadratic equation ax + bx + c = 0; a 0 are b ± b 4ac The solution set a { } b +, b of the equation is where = discriminant = b a a 4ac 31. The roots are real and distinct if > 0 3. The roots are real and coincident if = The roots are non-real if < If α and β are the roots of the equation ax + bx + c = 0; a 0, then (a) α + β = b a = Coeff.ofx Coeff.ofx (b) αβ = c a = Const.term Coeff.ofx 35. The quadratic equations whose roots are α and β is (x α)(x β) = 0 i.e. x (α + β)x + αβ = 0 i.e. x Sx + P = 0 where S = sum of the roots and P = product of the roots. 1.4 Sequences and series 36. For an Arithmetic Progression (A.P.) whose first term is a and common difference is d, (a) n th term = t n = a + (n 1)d (b) The sum of the first n terms = S n = n (a + l) = n {a + (n l)d} where l = last term = a + (n 1)d 37. For a Geometric Progression (G.P.) whose first term is a and common ratio is r, (a) n th term = t n = ar n 1 (b) The sum of the first n terms = S n = a(1 r n ) if r 1 1 r = a(r n 1) if r 1 r 1 = na if r = For any sequence {t n }, S n S n 1 = t n where S n = sum of the first n terms. 39. n r=1 r = n = n (n + 1) 40. n r=1 r = n = n 6 (n + 1)(n + 1) 41. n r=1 r3 = n 3 = n (n + 1) 1.5 Factorials and Probability 4. n = n! = (n 1)n 43. n! = n(n 1)! = n(n 1)(n )! = n(n 1)(n )(n 3)! = ! = n P r = n! (n r)! n C r = n! r!(n r)! 46. n P 0 = 1 n P 1 = n n P = n(n 1) n P 3 = n(n 1)(n ) n C 0 = 1 n C 1 = n n C = n(n 1)! n C 3 = n(n 1)(n ) 3!... Math formulæ by Satya 007/10/08 Page 3
4 48. n P r n C r = r! 49. n C r = n C n r n C r 1 + n C r = n+1 C r 50. If n C x = n C y, then x = y or x + y = n 51. If a, b R and n N, then (a + b) n = n C 0 a n b 0 + n C 1 a n 1 b 1 + n C a n b n C r a n r b r +... n C n a 0 b n 5. The general term in the expansion of (a + b) n is given by t r+1 = n C r a n r b r Trigonometry 53. π c = 180 ; 1 c = ( 180 π ) = ; 1 = radians 54. s = rθ where s = arc length, r = radius and θ is the angle in radians subtended by the arc at the centre of the circle. 55. A = 1 r θ = 1 rs where A = area of sector of a circle, s = arc length, r = radius and θ is the angle in radians subtended by the arc at the centre of the circle. 3 Trigonometric identities 56. sin θ + cos θ = 1 (1) 57. These follow by dividing 1 by cos θ and sin θ respectively: sec θ = 1 + tan θ () cosec θ = 1 + cot θ (3) 58. These follow because sec, cosec, cot are reciprocals of cos, sin, and tan: cos θ sec θ = 1 (4) sin θcosecθ = 1 (5) tan θ cot θ = 1 (6) 59. tan θ = sin θ cos θ cot θ = cos θ sin θ 3.1 Angular relations cos θ 1 i.e. cos θ 1 1 sin θ 1 i.e. sin θ sin nπ = 0, n I (7) cos nπ = ( 1) n, n I (8) sin(n + 1) π = ( 1)n, n I (9) cos(n + 1) π = 0, n I (10) Math formulæ by Satya 007/10/08 Page 4
5 6. cos( θ) = cos θ sin( θ) = sin θ tan( θ) = tan θ sin cos 1 3 tan π π 4 3 π 3 π 64. sin(nπ ± θ) = (sign) sin θ, n I, sign is determined by quadrant to which the angle belongs. 65. cos(nπ ± θ) = (sign) cos θ, n I 66. sin((n+1) π ±θ) = (sign) cos θ, n I, sign is determined by quadrant to which the angle belongs. 67. cos((n + 1) π ± θ) = (sign) sin θ, n I 68. If sin θ = sin α, then θ = nπ + ( 1) n α, n I 69. If cos θ = cos α, then θ = nπ + α, n I 70. If tan θ = tan α, then θ = nπ + α, n I 3. Sine-Cosine-Tangent Combos sin(α + β) = sin α cos β + cos α sin β sin(α β) = sin α cos β cos α sin β cos(α + β) = cos α cos β sin α sin β cos(α β) = cos α cos β + sin α sin β sin α cos β = sin(α + β) + sin(α β) cos α sin β = sin(α + β) sin(α β) cos α cos β = cos(α + β) + cos(α β) sin α sin β = cos(α β) cos(α + β) sin C + sin D = sin( C + D sin C sin D = cos( C + D cos C + cos D = cos( C + D cos C cos D = sin( C + D ) cos( C D ) sin( C D ) cos( C D ) sin( C D ) ) ) ) 74. Tan relations: tan(α + β) = tan α + tan β 1 tan α tan β tan(α β) = tan α tan β 1 + tan α tan β (11) 3.3 Halving angles (In the following, sometimes we use θ = α, and θ = α/) 75. sin θ = sin θ cos θ 76. cos θ = cos θ sin θ = cos θ 1 = 1 sin θ (1) 77. By 1, cos θ = 1 (1 + cos θ) and sin θ = 1 (1 cos θ) Math formulæ by Satya 007/10/08 Page 5
6 78. By 11, tan θ = tan θ 1 tan θ 79. If tan θ = t, then cos θ = 1 t 1 + t sin θ = t 1 + t More angular trigonometric relations 80. sin 3θ = 3 sin θ 4 sin 3 θ 81. cos 3θ = 4 cos 3 θ 3 cos θ 8. tan 3θ = 3 tan θ tan3 θ 1 3 tan θ 3.4 Trigonometric Rules 83. Sine Rule: In a ABC, the triangle. a = b = c = R sin A sin B sin C where R is the circum-radius of 84. Cosine Rule: In a ABC, a = b + c bc cos A b = c + a ca cos B c = a + b ab cos C 85. Projection Rule: In a ABC, a = b cos C + c cos B b = c cos A + a cos C c = a cos B + b cos A 86. Area of ABC = 1 bc sin A = 1 ca sin B = 1 ab sin C (half of the product of the length of two sides and the sine of the angle between them.) 3.5 Inverse trigonometric relations 87. cosec 1 1 x = sin 1 x sec 1 1 x = cos 1 x cot 1 1 x = tan 1 x 88. sin 1 (sin x) = x for π x π cos 1 (cos x) = x for 0 x π tan 1 (tan x) = x for π < x < π 89. sin 1 ( x) = sin 1 x for 1 x 1 cos 1 ( x) = π cos 1 x for 1 x 1 tan 1 ( x) = tan 1 x x R 90. If x > 0, y > 0 tan 1 x tan 1 y = tan 1 ( x y 1 + xy ) Additionally, if xy < 1, then tan 1 x + tan 1 y = tan 1 ( x + y 1 xy ) and, if xy > 1, then tan 1 x + tan 1 y = π + tan 1 ( x + y 1 xy ) Math formulæ by Satya 007/10/08 Page 6
7 4 Coordinate geometry 91. Distance formula: Distance between two points P (x 1, y 1 ) and Q(x, y ) is given by d(p, Q) = (x x 1 ) + (y y 1 ) Distance of the point P (x, y) from the origin is d(o, P ) = x + y 9. Section formula: If A = (x 1, y 1 ), B = (x, y ) and C(x, y) divides AB in the ratio m : n then x = mx + nx 1, y = my + ny 1 m + n m + n 93. Mid-point formula: If A = (x 1, y 1 ), B = (x, y ) and C(x, y) is the midpoint of AB then x = x 1 + x, y = y 1 + y 4.1 Triangles 94. Centroid formula: If G(x, y) is the centroid of a triangle whose vertices are A(x 1, y 1 ), B(x, y ), C(x 3, y 3 ), then x = x 1 + x + x 3, y = y 1 + y + y Area of a triangle whose vertices are A(x 1, y 1 ), B(x, y ), C(x 3, y 3 ) is = 1 x 1(y y 3 ) + x (y 3 y 1 ) + x 3 (y 1 y ) Area of a triangle whose vertices are O(0, 0), A(x 1, y 1 ), B(x, y ) is = 1 x 1y x y 1 4. Straight lines 96. Equation of the x-axis is y = 0 Equation of the y-axis is x = Equation of straight line parallel to x-axis and passing through point P (a, b) is y = b Equation of straight line parallel to y-axis and passing through point P (a, b) is x = a 98. Slope of a straight line m = tan θ = y y 1 x x 1 where θ is the inclination of the straight line and (x 1, y 1 ) and (x, y ) are any two points on the line. 99. Equation of a straight line Slope-origin form y = mx Point-origin form xy 1 = yx 1 Slope-intercept form y = mx + c Point-slope form y y 1 = m(x x 1 ) Two-points form y y 1 = x x 1 y y 1 x x 1 Double-intercept form xb + ya = ab Normal form x cos α + y sin α = p Math formulæ by Satya 007/10/08 Page 7
8 100. Parametric equations of a straight line are x = x 1 + r cos θ y = y 1 + r sin θ 101. General equation of a straight line is ax + by + c = 0 For this line, Slope= a b x-intercept = c a y-intercept = c b 4.3 Line pairs 10. The acute angle between two straight lines with slopes m and m is tan θ = 103. The straight lines with slopes m and m are mutually perpendicular iff mm = The straight lines with slopes m and m are parallel to each other iff m = m m m 1 + mm 105. Any line parallel to the line ax + by + c = 0 has an equation of the form ax + by + k = 0 where k R 106. Any line perpendicular to the line ax + by + c = 0 has an equation of the form bx ay + k = 0 where k R 107. The acute angle between the two straight lines ax + by + c = 0, a x + b y + c = 0 is given by tan θ = 108. By 13 The straight lines ax + by + c = 0, a x + b y + c = 0 are mutually perpendicular if aa + bb = 0 parallel if ab = a b identical if a = b = c a b c ab a b aa + bb (13) 109. The perpendicular distance of the point P (x 1, y 1 ) from the straight line ax + by + c = 0 is ax 1 + by 1 + c a + b The perpendicular distance of the origin (x 1 = 0, y 1 = 0) from the straight line is c a + b The distance between two parallel straight lines ax + by + c = 0 and ax + by + c = 0 is c c a + b 5 Mensuration 5.1 Solids 110. Sphere of radius r Volume = 4 3 πr3 Surface area = 4πr Math formulæ by Satya 007/10/08 Page 8
9 111. Right circular cone, radius r height h slant height l Volume = 1 3 πr h Curved surface area=πrl Total surface area = πrl + πr 11. Right circular cylinder, radius r height h Volume = πr h Curved surface area = πrh Total surface area = πrh + πr 113. Cube with side length x Volume=x 3 Surface area = 6x 114. Volume of a rectangular parallelopiped = length x breadth x height 5. Plane figures 115. Circle of radius r Area = πr Perimeter = πr 116. Triangle, area = 1 x base x height 117. Rectangle, area = length x breadth, perimeter = x (length + breadth) 118. Square, area = (side), perimeter = 4 x side 119. Area of a trapezium = 1 x (sum of parallel sides) x (distance between the parallel sides) 10. Area of an equilateral triangle = 3 4 a = 1 3 p where a is the length of a side and p is the length of an altitude. 6 Numerical Methods 11. Bisection Method: c = x 1 + x 1. False Position (Regula-Falsi) Method: x n a f(a) 1 = 0 x n f(x n ) Newton-Raphson Method: x n+1 = x n f(x n) f (x n ) f(x) = n th degree polynomial <=> n f(x) constant y n+1 = (1 + )y n y i = (1 )y i = E E 1 = Forward interpolation (Newton-Gregory): u = x x 0 n f(x) = f(x 0 ) + u f(x 0 ) + u(u 1)! f(x 0 ) +... Math formulæ by Satya 007/10/08 Page 9
10 15. Backward interpolation: ν = x x n n f(x) = f(x n ) + ν f(x n ) + ν(ν + 1)! f(x n ) Trapezoidal Rule: b a f(x)dx = h( y 0 + y n + y 1 + y y n 1 ) 17. Simpson s (one-third) rule: b a ydx = 1 3 h[(y 0 +y n )+4(y 1 +y y n 1 )+(y +y y n )] n is even. Math formulæ by Satya 007/10/08 Page 10
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