$3-sec^2x$
$9\:+\:9n\:=\:7n\:-\:1$
$\frac{d}{dx}ln\sqrt{cos\:2x}$
$\frac{-x^2-4}{-4x+8}$
$-1x-1x-1x-1x-1x-1x-1x-1$
$-2x+3+x-5$
$-9w+-2w^2+w^2$
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