$\frac{1+sin\left(2x\right)+cos\left(2x\right)}{2sinx\left(sinx+cosx\right)}=cotx$
$xydx+dy=0$
$\sin x\cos2x+\cos x\sin2x=\sin3x$
$4n-2+7n=20$
$x^2+20x-10$
$6+4x=sin\left(xy2\right)$
$5x\:+\:7\:<\:2x\:+19$
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