$\left(a+b\right)\left(2-b\right)$
$15a^2+ab+a^2$
$+\left(+11\right)-2+5-\left(-4\right)$
$\int-17\sin^4\left(t\right)\cos\left(t\right)dt$
$\left(x+2\right)\left(x\right)\left(x-2\right)\left(x-4\right)$
$\int\frac{1}{\sqrt{-9x+4}}dx$
$\:\:\frac{cot\left(\beta\:\right)\:}{sin\left(\beta\:\right)\:}+\frac{sin\left(\beta\:\right)\:}{cot\left(\beta\:\right)\:}$
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