$\left(13+2x\right)\left(2y-13\right)$
$8+3x\ge2x$
$1.012^{20}$
$cos^2\left(x\right)=\frac{1}{\sin^2\left(x\right)\cdot\cos^2\left(x\right)+\:cos^4\left(x\right)}$
$\lim_{x\to2}\left(3x-4\right)$
$\int\:\:e^{22x}sen\left(-21x\right)dx$
$( 3 x - 4 ) ( x + 8 )$
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