Let y = e ^ f (x ^ 2), find the second derivative of Y Let y = e ^ f (x ^ 2), find the second derivative of Y,

y'=e^f（x^2)*f'(x^2)*(x^2)'
=2xe^f（x^2)*f'(x^2)
y''=2e^f（x^2)*f'(x^2)+4x^2e^f（x^2)*[f'(x^2)]^2+4x^2e^f（x^2)*f''(x^2)

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