$6a^2b^2-9a^2b^2$
$\frac{w}{7}+6w+63$
$f\left(1\right)=2\left(1\right)^2-2\left(1\right)+3$
$1-x=0$
$\:\left(sen2x\:+\:2senx\right)\left(1-\cos\left(x\right)\right)$
$-12x^2+3x+1<0$
$\left(5x^2\:+2y^3\right)^3$
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