$\left(3x^2+y^9\right)dx+\left(9xy^8\right)dy=0$
$\int\left(\frac{x}{x^2+y^2}\right)dx$
$-69\cdot89$
$\sqrt[30]{16.x^8}$
$\frac{1-sinx}{1+sinx}\:=\:\left(tanx-secx\right)^2$
$\int\sqrt[8]{t}\left(5t^9-3tmas2\right)dt$
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