What is the second derivative of F '' (x) and y = (x ^ 2), The answer is 2F '(x ^ 2) + 4x ^ 2F' '(x ^ 2)

What is the second derivative of F '' (x) and y = (x ^ 2), The answer is 2F '(x ^ 2) + 4x ^ 2F' '(x ^ 2)

y'=2xf'(x^2)
y''=2f'(x^2)+2xf''(x^2)*(2x)=2f'(x^2)+4x^2f''(x^2)