$1-2\sin\:^2\left(x\right)=\frac{1-tan^2x}{1+tan^2x}$
$\frac{x^3+x^2}{x^2+5x+6}$
$736-14$
$\lim_{x\to-3}\left(\frac{3x^2-15}{x-\sqrt{5}}\right)$
$\lim_{x\to0}\left(\frac{5sinxcosx-x}{tanx-x}\right)$
$2x^2+2x-12$
$\frac{x^3-3x^2+7x}{2x^2+1}$
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