Math 104: l Hospital s rule, Differential Equations and Integration
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1 Math 104: l Hospital s rule, and Integration Ryan Blair University of Pennsylvania Tuesday January 22, 2013 Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
2 Outline 1 l Hospital s rule 2 Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
3 l Hospital s rule l Hospital s rule Last time we saw how to find certain 0 0 Theorem If Then lim x a f(x) = 0 = lim x a g(x), f(x) lim x a g(x) = lim f (x) x a g (x). limits using Taylor Series. Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
4 l Hospital s rule l Hospital s rule Last time we saw how to find certain 0 0 Theorem If Then lim x a f(x) = 0 = lim x a g(x), f(x) lim x a g(x) = lim f (x) x a g (x). Exercise: Find the following limit using l Hospital s lim x 0 e x 1 x x 2 limits using Taylor Series. Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
5 l Hospital s rule l Hospital s rule Last time we saw how to find certain 0 0 Theorem If Then lim x a f(x) = 0 = lim x a g(x), f(x) lim x a g(x) = lim f (x) x a g (x). Exercise: Find the following limit using l Hospital s lim x 0 e x 1 x x 2 limits using Taylor Series. Exercise: Use Taylor series to prove l Hospital s theorem supposing is well defined f (a) g (a) Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
6 Definition An nth order Ordinary Differential Equation (O.D.E.) on y(x) is an algebraic equation including y and its derivatives F(x,y(x), dy dx, d2 y dn y dx 2,..., dx n) = 0 A solution is any function that satisfies the above equation. Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
7 Definition An nth order Ordinary Differential Equation (O.D.E.) on y(x) is an algebraic equation including y and its derivatives F(x,y(x), dy dx, d2 y dn y dx 2,..., dx n) = 0 A solution is any function that satisfies the above equation. Example: An object near the surface of the earth acted on by gravity has velocity v(t) given by dv = dt v (t) = g Solve for v(t). Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
8 Initial value problem Definition An initial value problem is an O.D.E. together with an initial condition given by y(0) = c for some constant c. Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
9 Initial value problem Definition An initial value problem is an O.D.E. together with an initial condition given by y(0) = c for some constant c. Example: Solve the following IVP = cos(2x) and y(0) = 1. dy dx Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
10 Summary of Integration Techniques To solve O.D.E.s we need to be able to integrate. 1 u substitution 2 integration by parts 3 trigonometric substitutions 4 partial fractions 5 completing the square Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
11 U-Substitution f(g(x))g (x)dx = f(u)du The main difficulty is determining u = g(x).. Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
12 U-Substitution f(g(x))g (x)dx = f(u)du The main difficulty is determining u = g(x). Exercise Find x 2 e x3 dx. Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
13 U-Substitution f(g(x))g (x)dx = f(u)du The main difficulty is determining u = g(x). Exercise Find x 2 e x3 dx. Exercise Find (1+ln(x)) 3 dx. x Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
14 Integration by Parts u(x)v (x)dx = u(x)v(x) u (x)v(x)dx Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
15 Integration by Parts u(x)v (x)dx = u(x)v(x) u (x)v(x)dx Example: Derive the above formula from the product rule for derivatives and the fundamental theorem of calculus. Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
16 Integration by Parts u(x)v (x)dx = u(x)v(x) u (x)v(x)dx Example: Derive the above formula from the product rule for derivatives and the fundamental theorem of calculus. Example: Find xe x dx. Math 104:l Hospital s rule, andtuesday Integration January 22, / 8
Math 103 Day 13: The Mean Value Theorem and Tuesday How Derivatives OctoberShape 26, 2010 a Graph1 / 12
Math 103 Day 13: The Mean Value Theorem and How Derivatives Shape a Graph Ryan Blair University of Pennsylvania Tuesday October 26, 2010 Math 103 Day 13: The Mean Value Theorem and Tuesday How Derivatives
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