$\cot^2\left(a\right)\sec^2\left(a\right)=\csc^2\left(a\right)$
$6xy+7-4xy$
$\left(\:\frac{2}{5}x^5+\frac{5}{3}\:y\right)^2$
$-2\left(x+4y\right)\left(2x-3y\right)$
$\left(+682\right)+\left(-154\right)+\left(-25\right)$
$\left(x^m+x^n\right)^2$
$2xy^3\cdot x^2\cdot\left(2yx^{-1}\right)^3$
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