$\left(ad+5\right)\left(ad-5\right)$
$\frac{\cot\left(a\right)\cos\left(a\right)}{\cot\left(a\right)+\cos\left(a\right)}=\frac{\cos\left(a\right)}{1+\sin\left(a\right)}$
$\frac{3}{4}x+2=20$
$\left(x+6\right)\left(-8\right)$
$abx^2-xba-2ab$
$5v^3+135n^3$
$\left(b-\frac{1}{2}\right)\left(b-\frac{1}{3}\right)$
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