$123\cdot11$
$2cos\left(x\right)+2sin\left(x\right)tan\left(x\right)=0$
$1+\cos2x-\cos^2x=\cos^2x$
$\frac{dy}{dx}=4+9x+3y+72xy$
$\left(a^3-\:1\right)^3$
$\lim_{x\to0}\left(\frac{e}{x^2}\right)$
$r\:-\:2\:=\:5$
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