$\frac{x^4}{x+1}$
$x^2-3x-15\ge0$
$\lim\:_{x\to\:0}\left(\frac{cosx-1}{\:x}\right)$
$\int5^{-x}dx$
$\frac{\left(7\right)}{1-x^9}$
$a\left(x^2+4\right)+\left(bx+c\right)\left(x-3\right)$
$sen^{\left(2\right)}x+2cos^{\left(2\right)}x+\left(cos^{\left(2\:\right)}x\right)\left(cot^{\left(2\right)}x\right)=csc^{\left(2\:\right)}x$
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