$\frac{1}{\csc\left(x\right)\cot\left(x\right)}+\cos\left(x\right)$
$\left(-3\cdot7\right)+\frac{10}{5}$
$\left(3xy+2x^2\right)\left(2x^2-3x\right)$
$144x^2+81b^6$
$jaja\:30$
$x-1+-12x+10$
$x^2-1=1-x^2$
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