$2x-3-\left(x+1\right)$
$2f^2+13f+15$
$\int xa^{2x}dx$
$\frac{\sin\left(a\right)}{1-\cos\left(a\right)}=\frac{1}{\sin\left(a\right)}+\frac{1}{\tan\left(a\right)}$
$x^2y^2+xy-y=0$
$4yx^2z^3\cdot2x^{-3}$
$\int6xsec^2\left(x\right)\:dx$
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