$\frac{14}{6}-\frac{1}{3}$
$-5m+2mn-4n^2+6m-7mn-m+n^2$
$\frac{dy}{dx}=4-4\cdot y+y^2$
$6\cos^{2}x+17\cos x+7$
$\lim_{x\to-\infty}\left(\frac{x^2-28}{x-5}\right)$
$\frac{1}{2}\cdot\sin\left(x\right)+1-\cos^2\left(x\right)=0$
$1-\csc^2x+\csc^2x$
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