$\frac{x}{x^2+2x}$

$sin^4\:x\:=\:0.125\left(3\:-\:4\:cos\:2x\:+\:cos\:4x\right)$

$\left(3x^2-y^2\right)+\left(-11xy+9y^2-14\right)$

$-\left(\infty-1\right)^2$

$\left(1+x\right)^{\frac{1}{2}}\left(1-x\right)^{-\frac{1}{2}}$

$\left(2x^2\right)\left(4x\right)^2$

$\int\left(\frac{2x-3}{x^2+6x+13}\right)dx$