$os\left(x+y\right)cos\left(x-y\right)=cos^{\left(2\right)}x-sen^{\left(2\right)}y$
$x^3+5x-1:x^2+1x\:$
$x^2-\frac{2}{4}x+\frac{1}{16}$
$\sin\left(x\right)=-\frac{3}{5}$
$x^2-3x-5$
$\frac{x^2-x-6}{x-5}$
$\lim_{y\to0}\left(\frac{6y}{3y^3-3y}\right)$
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