$\frac{dy}{dx}=x\sqrt{y}cosx$
$\frac{7n}{n^3}$
$20\:por\:12$
$1-\sin\left(n\right)^2$
$16sin^2\theta\:-12$
$\left(1+\tan^2x\right)\left(sin^3x-sin^5x\right)=sin^3x$
$8\left(\:x\:-\:9\right)\:=\:-16$
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