$cot\left(x\right)=\frac{1+cot^2\left(x\right)}{csc\left(x\right)sec\left(x\right)}$
$\left(5y-3\right)\left(5y+8\right)$
$3.77\cdot1.5$
$2^{18}$
$\int\frac{x^2-6}{\left(x+2\right)\left(2x-1\right)}dx$
$-7y^2+6x^2+3y^2-4x^2-6-2-2$
$5x\:+\:3x\:-\:6x\:$
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