$4-6-7-190$
$\:3\left(4a\:-\:2\right)$
$5a-2ab+4ab^2$
$\left(1-\cos\left(a\right)\right)\left(1+\cos\left(a\right)\right)=\frac{1}{\csc\left(a\right)^2}$
$-10=n-9$
$\lim_{x\to1}\left(\frac{sinx-1}{arcsin0}\right)$
$\left(4b+8\right)\left(4b-8\right)$
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