$\frac{d^2}{dx^2}\left(-x^2+6x-2\right)$
$-b-b$
$4ydx+3xdy=0$
$\frac{2^2+10^2}{10-2\cdot7}$
$tany=2.4142$
$\int\left(\frac{x-1}{\left(x+2\right)^2\left(x-3\right)}\right)dx$
$3cot^2x=9$
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