$ax+bx^2$
$\int_2^{\infty}\left(\frac{2x}{x^2-3}\right)dx$
$\left(b+2\right)\left(x-5\right)$
$\lim_{x\to\infty}\left(xsin\frac{20}{x}\right)$
$sen\:x\:+\:cos\:x\:\cdot\:ctg\:x\:=\:csc\:x$
$\sqrt{x-4=12}$
$-8+1+4$
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