What are the derivatives of these functions?

Question

1. (f(x)*g(x))/g(x)
2. (f(x))³
3. (f ° g)(x)

Answer 1

1) (fg)/g = f , so the derivative is just f'

2) f^3 has derivative 3 f^2 f' by chain rule

3) f(g(x)) has derivative f'(g(x)) * f'(x)