$3m-20\:si\:m=5$
$\left(3a+b+2c\right)^2$
$4x-8=\left(4\right)$
$\log\left(15x\right)=\log\left(30\right)$
$\frac{dy}{dx}=3x+2$
$\frac{1-sin\left(x\right)^2}{csc\left(x\right)^2-1}0$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{tanx}{\left(\frac{4}{2x-\pi}\right)}\right)$
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