$\frac{sen\:a}{sec\:a}=sen\:a$
$16^2-8x+15$
$4w\left(-w^2-2w-2\right)$
$\:\left(x\:-\:8\right)\:\left(x\:-\:8\right)$
$x-20\le50$
$\lim_{x\to\infty}\left(\frac{\left(x^4\right)}{\ln\left(x\right)}\right)$
$\sin^22x=1$
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