$\cos^2\left(x\right)\frac{dy}{dx}+y=1$
$-\:7\:-\:52\:+\:7\:+\:28\:-\:9$
$-4x+8=x\:+8$
$\lim_{x\to-3}\left(\sqrt{-x+3}\right)$
$x^2+14x+5=0$
$\log\left(x+9\right)-\log\left(x\right)=1$
$4x+2y+y'\left(3y-2x\right)=0$
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