$\lim_{x\to\infty}\left(\frac{3x+\left|1-3x\right|}{1-5x}\right)$
$2\:+\:5\:.\:6:2$
$\int3x^{-7}dx$
$\frac{senx\left(cscx+cosx\right)}{cosx\left(secx+senx\right)}$
$6+x\le-1$
$\frac{5\left(3x+6\right)+30}{15}$
$\frac{cosx}{tanx}sinx$
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