$\int3x\:\cos^2\left(2x\right)\:dx$
$-5x^2+5xy-15y^2+15x^3-15x^2y+45xy^2$
$5t+45=45$
$\int_{-\infty}^{-3}\left(\frac{x}{x^2-4}\right)dx$
$\frac{x-2}{3x^{2}-5x-2}$
$\int\sin\left(14x\right)\sec^2\left(\cos14x\right)dx$
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