$20-2^2-1^3\cdot3$
$x+7=-5$
$5\frac{dy}{dx}=\frac{e^ysin^2}{ysecx}$
$-7.75\:+\:1.25$
$cos^4\theta\:\:+\:2cos^2\theta\:\cdot\:\:sin^2\theta\:\:+\:sin^4\theta\:\:$
$x^2+6x=40$
$x^2-4x+6$
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