$\frac{\left(-2+x\right)}{x}=\frac{\left(2-x\right)}{-x}$
$-x^2+7x$
$100-x^2y^2$
$\sec^2\left(10\right)\sec^2\left(50\right)\sec^2\left(70\right)$
$\frac{dy}{dx}=\frac{4x}{1+y}$
$\sqrt{2\sqrt{2\sqrt{2\infty}}}$
$-\int mdx$
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