$\frac{2\sin\left(x\right)\cos\left(x\right)}{1-\cos2x}$
$36.54\left(2.7\right)$
$81n^3m^4+61n^3m^4$
$1500x<\frac{1500x-450}{8}$
$\left(\frac{x}{5}-\frac{2}{x}\right)\left(\frac{x}{5}+\frac{2}{x}\right)$
$\frac{7}{x},\:a=-3$
$y=\left(-x^3+3\right)\left(-2x+5x^{-2}-5\right)$
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