$\frac{2}{3}x^2y\left(2^{-1}xy^{-1}+3x^{-2}y^2\right)$
$a^2+5a-84$
$\frac{a+1}{b}=\frac{a-1}{b}+\frac{b+1}{a}$
$5\log_b\left(x\right)-\log_b\left(y\right)$
$\frac{d^2}{dx^2}\left(ax^2\right)$
$\lim_{x\to0}\left(\frac{sin5x}{ln\left(1-x\right)}\right)$
$\tan\left(x\right)+1=\sec^2\left(x\right)$
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