$\int\left(5\cos\frac{x}{5}\right)dx$
$\cos\left(2x-\pi\right)=-\cos\left(2x\right)$
$\frac{-5}{6}xy-\frac{7}{6}xy$
$\frac{2x+21}{2x^2+9x-5}$
$\int\frac{7}{x^2\sqrt{49-x^2}}dx$
$2xy'=y$
$2y+2y+2x$
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