$15x^2+5x^2+x-5\:entre\:3x+2$
$\cos^2a+\sin^2a\cdot\cos^2a$
$f\left(x\right)=\frac{x^2+x+1}{\left(x+1\right)\left(x+2\right)\left(x-3\right)}$
$\left(\frac{x^2}{3}\right)^2$
$12x-3\ge42x+7$
$\left(-0.3\right)\cdot\left(-0.3\right)\cdot\left(-0.3\right)$
$\left|-9\right|+-12$
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