$\int\left(\frac{-3}{\left(x^2+3\right)^{\frac{3}{2}}}\right)dx$
$-8-5-2-7$
$\left(4x-6y^2-9\right)\left(3x^2+2x+1\right)$
$0.25\int\sqrt{4-x^2}dx$
$\frac{1}{2}x^2+\frac{1}{6}xy+\frac{1}{2}y^2$
$\int_1^n\left(\frac{x}{x^2-x-6}\right)dx$
$2\tan^2x+15\tan x+25$
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