$x^2-4x+3\le0$
$\frac{1+sen^2\theta\:}{cos^2\theta\:}=\frac{1+tan\theta\:}{1-tan\theta\:}$
$\ln\left(\sqrt{x^2+3x}\right)$
$12a\left(a^2+3b-2ab^2\right)$
$\int_0^x\left(\frac{\cos\left(y\right)}{y}\right)dy$
$\left(-4\right)+1\left(-5\right)+5$
$1-x^2\le-3$
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