$\left(x-2\right)\left(3x-1\right)=0$
$\frac{2x-1}{x-2}<\:3$
$\frac{-2\left(sen^2x-senx\right)}{1+senx\cdot cosx}$
$sin^2x\:tan^2x\:=\:\frac{1}{cot^2x}-sin^2x$
$178.288=33.2-x$
$a^3-a+a^2\cdot a-1$
$a^8+18a^481$
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