$\frac { 2 n - 2 n } { 2 n }$
$\left(-316\right)\cdot200$
$\int\frac{u^5}{u^3+1}du$
$2xy+xy-x$
$\frac{\left(tan\:alpha\:+\:tan\:beta\right)}{cot\:alpha\:+\:cot\:beta}$
$\frac{8x^4+4x^3+6x^2}{2x^2+1}$
$\tan\left(x\right)\sin\left(2x=\frac{2}{\csc^2\left(x\right)}\right)$
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