$\left(\cot\left(x\right)\right)^2=\csc\left(x\right)^2+2\cot\left(x\right)$
$36x^2+9y^2=18z^2$
$-\left(-4\right)e$
$\left(2y-3a\right)^2$
$\frac{1}{3}\int sec^2x\:\sqrt{1-tanx}dx$
$15\left(x+y\right)+4\left(y+x\right)$
$4x^2-13+7x+2-8x-6x^2$
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