$y\frac{dy}{dx}=x^3+1$
$\int\frac{16-4x}{\left(x-1\right)\left(x+3\right)}dx$
$\left(7^2\right)^5$
$\int\frac{-5}{\sqrt[4]{x}}dx$
$\frac{3^3.\:3^{-5}}{3^{-4}}$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{2\left(senx-cos^2x\right)}{sen2x}\right)$
$bm+bn+un+um$
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