$sen\:x\:+\:tg\:x\:=\:sen\:2x$
$4x^2\:+\:16x\:-\:206x^2\:+\:60x\:+\:150$
$4x^2+10x+4=0$
$-2-4.\left[-2+\left(7-2\right)\right]$
$x-\left(y-z\right)$
$x^2-5x-4\ge0$
$-2+\frac{4m}{n}$
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