$\frac{d^2}{dx^2}\left(bcos\left(x\right)\right)$
$x^2-17x+38=0$
$-6\left(5x^2-3xy\right)-8y^2-2xy$
$\left(y-1\right)dx+x^2dy=0$
$d^{-5}.d^9.d^4$
$4x^2-8x-21$
$\int\left(\frac{x^3}{5-x^4}\right)dx$
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