$\frac{d^4}{dx^4}\left(2x+1\right)^4$
$\frac{2\left(x^2+2y^2\right)}{x^2+4y^2}$
$\lim_{x\to0}\frac{e^x+e^{-x}}{\sin\left(x\right)}$
$\tan\left(1.5\right)$
$3.3m\:-\:4\:-3.3m\:-\:7$
$\log_{10}\left(\frac{4x-1}{4x+1}\right)$
$\frac{3x^2-2}{x^2-1}$
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