$\left(\sqrt{x}-1\right)\left(2\sqrt{x}+5\right)$
$\int\frac{x^2}{\sqrt{9\:-\:x^2}}dx$
$\frac{dy}{dx}6y$
$\int\frac{x-6}{x\sqrt{x+16}}dx$
$sen\:x\:+\:cos\:x\:\cdot\:ctg\:x\:=\:csc\:x$
$\lim_{x\to5}\left(\frac{13x^2-13x-10}{2x^2-7x-15}\right)$
$3x^2-x-3=0$
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