$\int\frac{2x+3}{\left(x^3+3x^2\right)}dx$
$x^2\:\frac{dy}{dx}\:-\:y=0$
$\lim_{x\to0}\left(1-\cos\left(9x\right)\right)^{tanx}$
$10x=200$
$5d-d$
$f\left(x\right)=\ln\left(\frac{x}{x^2+1}\right)$
$am+6bn+3bm+2an$
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