$\left(\sqrt{4x^2}\right)\left(\sqrt{3}\right)$
$\sin^2\infty\cdot\sec^2\infty\cdot\cot^2\infty=1$
$a^2+ax$
$\frac{x-7}{x-9}=\frac{2}{x-9}$
$\frac{d^2}{dx^2}\left(\sqrt{x^2+y^2}\right)$
$\left(c+4\right)^{-\frac{3}{2}}$
$3x\:e^x-3e^x$
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