$3\left(2x+2\right)+x+5=-10$

$\lim_{x\to\infty}\left(\sqrt{x^2+7x}\right)$

$sin\left(x\right)\cdot\:\sin\:\left(x-y\right)+cos\:\left(x\right)\cdot\:cos\:\left(x-y\right)=cos\:\left(y\right)$

$\int sec\:xdx$

$\left(x+y\right)\left(x-x\right)$

$\int_0^1\left(2\pi x\left(e^{-x}\right)\right)dx$

$\int\frac{x^2-4x-9}{x^3-6x^2+9x}dx$