Calculus homework due 4-23-15

Find the derivative of each of the following functions.

1. f(x)=\sin\left(\frac{x^3+1}{e^x}\right)

2. f(x)=e^{\tan(4x)}

3. f(x)=\sec\left(\frac{x^3}{3}-x^2\right)

4. f(x)=\sqrt{x^4+x^2}+x^2

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