$2x+3+6x+25+90$
$\cos\left(2x\right)=3-5\sin$
$\int\frac{e^x}{e^x-3}dx$
$z\:=\:2xy$
$-x-11+3$
$\frac{d}{dx}\left(\frac{\left(-x^3+4x\right)}{4x^2+1}\right)$
$\frac{dy}{dx}+2y=e^{3x},y\left(0\right)=3$
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