$u=xg\left(x+y\right)+ym\left(x-y\right)$
$\int\left(3xcosx\right)dx$
$3x^3\cdot2x$
$0\cdot\left(-50\right)$
$\frac{\tan\left(23^{\circ}\right)}{\cot\left(23^{\circ}\right)}-\frac{1}{\sin^2\left(67^{\circ}\right)}$
$\left(2x+8\right)\left(2x-9\right)$
$\tan\left(3\right).\tan\left(3\right)\cdot\cos\left(3\right).\cos\left(3\right).\cot\left(3\right)\cdot\cot\left(3\right)\cdot\sin\left(3\right).\sin\left(3\right)=1$
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