$\int_{-2\cdot\pi}^{-\pi}\left(1\cdot cos\left(nx\right)\right)dx$
$8\:-\:\left(+5\:-\:-\:5\right)\left(-1\right)$
$7\sqrt{20}$
$\frac{d^2}{dx^2}\left(\frac{1}{x^2+y^2}\right)$
$\int5\cdot\cos\left(6x-1\right)dx$
$\frac{d}{dx}x^{5x}$
$\left(x+2\right)\left(5x-3\right)$
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