Given f(x)=∫0x2et2dtf(x) = \int_0^{x^2} e^{t^2} dtf(x)=∫0x2et2dt, what is the second derivative f′′(x)f''(x)f′′(x)?
2ex4+8x4ex42e^{x^4} + 8x^4e^{x^4}2ex4+8x4ex4
2xex42xe^{x^4}2xex4
4x2ex44x^2e^{x^4}4x2ex4
ex4+2x2ex4e^{x^4} + 2x^2e^{x^4}ex4+2x2ex4