$-4r\:\cdot\:3\:\cdot\:2r$
$-\frac{50}{-2}$
$\frac{\left(1-sinx\right)^2}{1-sin^2x}=\frac{1-sinx}{sinx+1}$
$-3x-8<1$
$\frac{cos\left(x\right)^2}{cot\left(\frac{x}{2}\right)-tan\left(\frac{x}{2}\right)}=\frac{1}{4}sen\left(2x\right)$
$\frac{2m}{5\:\:\:\:}=\frac{1}{3}\left(2m-12\right)$
$3x+2>\frac{1}{3}-x$
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