$3xy+2xy^2-36xy+35xy^2$
$7x^3\cdot10y^3x^5\cdot8yx^3$
$\int20t^4e^{-t^5}dt$
$2\left(5x-4y\right)-\left(7x+y\right)\:$
$4x^2-36+9$
$\tan\left(270-x\right)=\cot$
$\left(x^2-49\right)+\left(x-7\right)$
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