$n+0.9n\cdot0.5$
$\frac{2\:cot\:x}{1-cot^2x}=-tan2x$
$\int\:\:x^{3y}\cdot\:\frac{sin\left(x\right)}{x^3}dx$
$54x^2\:218xu\:16m^2$
$2x\:-\:5\:<\:9$
$\left(x-1\right)\left(x+2\right)\le\left(x-3\right)\left(x-1\right)$
$\frac{3}{7}z^2\cdot\:\frac{14}{21}x^2y$
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