$+9-12+5-13+66-7-15$
$\lim_{x\to3}\left(\frac{\sqrt{x^2+9x+3}}{x-3}\right)$
$u+16<7$
$0-\left(-1950\right)+987-\left(-342\right)$
$\int\frac{3^{cot\left(2x\right)}}{sin^2\left(2x\right)}dx$
$\int\left(\frac{4}{csc3x}\right)dx$
$5y^2-13y-6$
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