$-5m^2+5m^2$
$cos\pi\:\:x-sin\pi\:\:$
$\left(-2x+1\right)^2-3\left(x-1\right)-\left(x-2\right)^2$
$\frac{sec\:\theta\:\:\:-1}{1-cos\:\theta\:\:}=sec\:\theta\:$
$3x^{2}+x-4=0$
$9 x = 108$
$\left(\frac{2x-3y}{y\:\:\:\:x}\right)^3$
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