$\frac{d}{dx}\left(-2\cdot\ln\left(\frac{x-30}{60}\right)\right)$
$498+71$
$5\left(a+b\right)-3$
$\frac{dy}{dx}y=ln\left(15x\right)+9x$
$\int\frac{\sqrt{64-x^{2}}}{x}dx$
$10y^2-x=0$
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