$\sin\left(-x\right)\cdot\cos\left(-x\right)\cdot\csc\left(-x\right)$
$6^2+26-15$
$49m^2-121n^2$
$2x\:dx\:=\:y\:dy$
$\lim_{x\to0}\left(\frac{x^2+x}{2}\right)$
$\left(1-3x\right)\left(1+3x\right)$
$\left(5x+2m\right)^3$
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