$\frac{dy}{dx}-xy=5x$
$\cos\left(a\right)\cdot\cos\left(2a\right)+2\cos\left(a\right)=0$
$\frac{\cos\left(x\right)}{3}=\frac{1-\sin^2\left(x\right)}{3\cos\left(x\right)}$
$x\:y'=y$
$1+4x^2\left(1+2x^2\right)$
$\frac{\csc}{cot}$
$\left(o-6\right)^2$
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