$\ln\left(e^5\right)-\ln\left(e^{12}\right)$
$\left(a\:-\:b\right)\:-\:\left(b\:-\:a\right)^2$
$\ln\left(5x^2+2x-7\right)$
$30a^2+17a-21$
$\frac{3x+5}{x^2+3x+2}$
$\frac{1+e^{2t}}{e^{2t}}$
$\frac{dy}{dx}+\frac{y}{x}=2$
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