$\frac{x^2+3x+4}{2x+2}$
$5x^2-7x+2+\frac{49}{5}$
$cos^4a\:-\:sin^4a\:+\:1=2\cos^2a$
$\frac{x^2+1}{x+2}$
$5\left(a+8\right)+3\left(6a+3\right)$
$9b^2-16$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{\tan\left(x\right)}{\frac{21}{2x-21}}\right)$
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