$\frac{x}{x^2y^2}$
$5b\left(1+2a\right)+4\left(2a+1\right)$
$\frac{dy}{dx}=\frac{y}{x^2-20x+75}$
$\lim_{x\to2}\left(\frac{\sqrt{x+7}-3}{\sqrt[3]{x}-\sqrt[3]{2}}\right)$
$1\:<\frac{3}{x}$
$sin^4x-cos^4x=2sin^2-1$
$\left(7ax^2-4by^2\right)^2$
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