$a^2-18a+22$
$5-\left|8\right|\cdot2$
$+3-10+5-15\left(3\right)$
$3\:sen\:x\:-\:cos2\:x\:-\:3\:=\:0$
$x+2\sqrt{2xy}+2y$
$1-\cos^2e=\sin^2e$
$2cosx-\sqrt{3}=0$
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