Find f′(x)f'(x)f′(x) for f(x)=e−x2f(x) = e^{-x^2}f(x)=e−x2.
−2xe−x2-2xe^{-x^2}−2xe−x2
2xe−x22xe^{-x^2}2xe−x2
e−x2e^{-x^2}e−x2
x2e−x2x^2 e^{-x^2}x2e−x2