$\frac{\tan\left(\theta\:\:\right)}{ctg\:\theta\:\:}+1$
$\frac{x\:-\:4}{x^2\:-\:8x\:+\:16}$
$x+20=4x-4$
$\left(-2a+5b\right)\left(2a-5b\right)$
$2-8\sin=6$
$\int_{-\infty}^0e^x\cos\left(2x\right)dx$
$11b+ab$
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