$3^{x-3}=243$
$\left(3xb^2\right)^4$
$\lim\:_{\theta\:\to\:0}\left(\frac{sen3\theta\:}{tan\theta\:}\right)$
$\int_1^{\infty\:}\frac{\left(2x-3\right)^2}{x^2}\:dx$
$-2\le12-3x$
$\frac{z}{2}=2$
$x^2+\:2x+1>0$
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