$\frac{\left(a+b\right)^2}{\left(a-b\right)^3}$
$\left(x^3-81x\right)$
$\frac{34}{2}+12$
$\lim_{x\to\infty}\left(\frac{\cos x}{x-1}\right)$
$\int\frac{\sec^{2}x}{\sqrt{\tgx+2}}dx$
$0,357+47,2-5,28$
$z^3+9z^2+27z+27$
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