$1+\left(\cot^2+\tan^2\right)\cos^2$
$cos^{-1}\left(cos\left(-\frac{3\pi}{8}\right)\right)$
$5\csc\left(\theta\right)-10=0$
$-5\left(6\right)$
$2x^2.\left(2x+3\right)^2-x.\left(x+1\right)\left(x-1\right)-5.\left(3x^2-x\right)^2$
$mn^{3}-m^{3}n$
$\left(7a-3b\right)\left(a+5b\right)$
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