$\frac{3x-1}{x^2-1}\le1$
$\lim_{x\to0}\left(\frac{sen\:x^{\left\{2\right\}}}{x}\right)$
$\left(\sin\theta+\cos\theta\right)^{2}=1+\sin2\theta$
$1-\left(sin\theta\:-cos\theta\:\right)\left(sin\theta\:\:-cos\theta\:\right)$
$x^2+4x-32>0$
$1+2\cdot5$
$\sqrt{5a^3}$
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