$\sin x\left(+\cot x\right)+\cos x\left(1-\tan x\right)$
$-9a^2-12ab+15ab^3b^2-24ab^3$
$x-7=2x+1$
$\lim_{x\to a}\left(\frac{x^2-a^2}{\sqrt{x}-\sqrt{a}}\right)$
$\left(5a+25\right)^2$
$\left(b-7c\right)^2$
$5^{\frac{2}{3}}y^{-\frac{1}{2}}z^{\frac{4}{3}}$
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