$\frac{d^2}{dx^2}\left(4\:e^{2x}\right)$

$\int_0^{\frac{\pi}{4}}\left(\frac{1-\sin\left(x\right)}{\cos\left(x\right)}\right)dx$

$\lim_{x\to h}\:\:\frac{x^2+h^2}{x+h}$

$-43-\left(-15\right)$

$\frac{dy}{dx}=\left(2x-\left(x^2\right)\right)$

$\frac{d}{dx}x^3-3xy+y^3=1$

$-399+x=400$