$\left(1-\cos\left(x\right)\right)\cdot\sin\left(x\right)$
$3x+2x-x+2^2$
$12m^3n^2-6m^2n^3+3mn$
$\frac{\cot^2}{\cos^2}$
$\frac{3}{2a}+\frac{1}{6a}$
$\left(x^2-5\right)^2$
$\frac{2\:tan\:x}{1\:+tan\:x}=sen^2x$
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