$5a^2+15ab$
$cos\left(x+y\right)=cos\left(x\right)cos\left(y\right)-sin\left(x\right)sin\left(y\right)$
$\left(4x^2-2y^5+z\right)^2$
$\frac{1}{tanxcotx}=sinxcosx$
$\int te^{-2x}\:dx$
$2x^2+4x+10$
$x^2-20x-300$
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