Question

find f(x) prime

http://webwork.math.ttu.edu/wwtmp/equations/96/9e19c155a90c794bf05182053f655d1.png

Answer 1

is the derivative of cos= -sin? I think it is... 2x^3sin(x); bring the 3 down 2*3=6, x^(3-1)= x^2. sin(x) goes to 1cos(x).. ur first term is then 6x^2cos(x)
second term:
x^1 goes to 1. 1*3= 3. cos(x) goes to -1sin(x)
so you have all togther

6x^2cos(x)+3sin(x).