$\frac{1}{\pi}\int_0^{\pi}\left(\left(\pi-x\right)sen\:nx\right)dx$
$3\cdot0^2+2\cdot0+15$
$-0.75x^3+9x-15$
$4\cdot\left(-9\right)\cdot\left(-3\right)\cdot\left(-1\right)$
$\left(+4\right)\:+\:\left(7\right)\:+\:\left(+12\right)\:+\:\left(+16\right)$
$\frac{dy}{dx}=\frac{-4-2x}{3y^2-5}$
$\left(\frac{2}{5}n-2\right)\left(\frac{1}{2}n-15\right)$
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