MATH-UA 211 Lecture Notes - Lecture 10: Tangent, Quotient Rule, Product Rule

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Function composition fog - chain rule ( d dx)[fog]=( d dx)f (g ( x)) df (g( x)) dx g" (x: f(x) 5x 8 view as function comp, h(x)= x , g(x)= 5x 8, f(x)= h(g(x), special case- 2 5x 8 ( d dx)[f ( x)]n o o. N[f ( x)]n 1 f "( x) ( d dx)( x2+6x)17=17(x2+6x)16 (2x+6) Chain+ product rule f ( x)=(x2+3x+7)6(2x2+7: = [ g( x )]6 h( x, f"(x)= h( x)( d dx)[ g( x)]6+[g( x)]6( d dx)h( x) Chain rule+ quotient rule f ( x)=( x2+1 ( x2 2))3 ( h( x) g( x))3 ( h(x) g( x)) Finding an equation of a tangent line y= 1+x3at (2,3: y"= 2 1+x3 3 x2: m=y"(2) = 2, y-3=2(x-2) = y=2x-1. Higher order derivatives: given f(x, f"(x)= first derivative, f""(x)= ( ( d dx)f " x second derivative. If f""(x)<0, f"(x) is decreasing: f(x)= 6 x2 3 x3+7x, f"(x)= 12x 9 x2+7, f""(x)= 12x-18.

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