$cos\left(x\right)^2=\frac{1-cos\left(x\right)^2}{tan\left(x\right)^2}$
$2ab+6ab-ab$
$6y^2-19y+3$
$dy=xdx$
$\lim_{x\to10}\left(\frac{x\:ln\left(2x+1\right)}{4\cos\left(4x-4\right)}\right)$
$\left(x^2+c\right)\left(x^2-7\right)$
$\frac{3z^6}{2z^4}$
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