Find 𝑓 ′(x^2) if 𝑑/𝑑𝑥[𝑓(𝑥2)]=𝑥^9

Question

find: f '(x^2)=

Answer 1

since d/dx f(x^2) = f'(x^2) * 2x = x^9
I guess f'(x^2) = 1/2 x^8