$82-\left(22+21\right)$
$x^3+y^3=133$
$\frac{2}{6x-2}+\frac{x}{9x^2-1}$
$\cos2x=\left(1+\sin x\right)\left(1-\sin x\right)$
$\left(4x-3x^3+2x^2-1\right)\cdot\left(4x+2x^2+3\right)$
$\lim_{x\to0}\left(\frac{sec^2\left(x\right)-\cos\left(x\right)}{x^3}\right)$
$-38\cdot18$
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