$\int-\frac{cos\left(x\right)}{sin\left(x\right)^3}dx$
$\frac{x}{27+x^3}$
$\lim_{x\to\infty}\:\left(x+e^x\right)\frac{2}{x}$
$-\sqrt[4]{-81}$
$z^3+z+xy=1$
$-5,345\cdot2,15$
$-27-1$
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