$-4k-8+4k$
$r+\left(-5r\right)$
$4a^2\cdot5a^5$
$1+7+19+13$
$-21\:-\:2\left(25\right)$
$\left(\sin\left(a\right)-\cos\left(a\right)\right)^2-\left(\sin\left(a\right)+\cos\left(a\right)\right)^2$
$\int3tan^5\left(x\right)dx$
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