$\left(3x^2\:-\:2x\:+\:7\right)\:\left(x\:-\:9\right)$
$\int\frac{2x^3+3x^2+1}{2x+1}dx$
$5a+18<-27$
$\left(+1\right)-\left(-7\right)-\left(+3\right)$
$\left(3x^2+5n\right)^3$
$2x^{-2}y^4\:x\:2y^3$
$\lim_{x\to0}\left(\frac{sen\left(x\right)}{x}\right)$
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