$\int x\:2^{-x}\:dx$
$-65+4$
$\left(5w+x\right)^2$
$x^4+4x^3+6x^2+4x+1$
$-2\left(-2x+3\right)\left(2x+3\right)$
$x^2+\:+2x\:\:$
$\frac{\left(sec\theta\:+1\right)\left(sec\theta\:-1\right)}{tan^2\theta\:}=1$
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