$\csc\left(x\right)+\cot\left(x\right)\cdot1-\cos\left(x\right)$
$\left(3x^2-8x+4\right)\:e^{-2x}$
$3x-5=1$
$\left(-1-k\right)^2$
$\left(3z-1\right)^2$
$\frac{x^2+2xy\:-y^2}{\left(x+y\right)^2}$
$\int\left(\frac{1}{4+9x^2}\right)dx$
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