$x\frac{dy}{dx}=\frac{\sqrt{x+1}}{y}$
$\left(1-\sin\left(a\right)^2\right)\frac{\sin\left(a\right)}{\cos\left(a\right)}=\sin\left(a\right)\cos\left(a\right)$
$6n^2-5n=6$
$-3\left(5+x\right)+4$
$121c+66c^2+9$
$\frac{du}{dx}-3u=3x$
$\left(3x+2vx\right)dx+2\:xdy=0$
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