$\frac{d^2}{dx^2}\left(e^x+\sin\left(x\right)\right)$

$\int\left(2x^2+1\right)^23xdx$

$12-3x\ge-6$

$\int\left(-x^{-2}\right)dx$

$\lim_{x\to0}\left(\frac{\left(e^{4x}-e^{-4x}-8x\right)}{x-sin\left(x\right)}\right)$

$\lim_{x\to-\infty}\left(x^5e^x\right)$

$\left(20-x\right).20$