$x\frac{dy}{dx}-\tan\left(y\right)+2x^2\tan\left(y\right)=0$
$\left(2x-1\right)+\left(x^2+2x-5\right)$
$\frac{d^3y}{dx^3}=e^{-x}$
$6q+1+5q$
$t^2-t+25$
$-12=12x+36$
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