$\left(a+8\right)\left(a-13\right)$
$4\sin\left(x-2\right)=0$
$\int-9\:dx$
$5x+14y^2+15y^2$
$\left(x^3+1\right)^2\left(x^2-1\right)^3$
$\int\sin^2\left(7x\right)dx$
$\left(-13\right)\left(-65\right)$
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