$\frac{d}{dy}\:xy+\frac{y^2}{x^2}$
$\int\ln\left(\frac{\left(m-rt\right)}{m}\right)dt$
$\frac{x^4-5x^3+4x-2}{x-3}$
$a^3-4a^2+6a-4$
$2x+9=5x+30$
$-2<-\frac{3y}{5}+2$
$\lim\:_{x\to\:\infty\:}\left(\frac{log\left(x+1\right)}{sen\left(x\right)}\right)$
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