$4+7b^2+2+2b^2+3b$
$2x^2-x-x-2x+4$
$\frac{\left(-\infty\right)}{\left(-\infty\right)^2+2}$
$4x^2+19x+22$
$8a\:2\:b\:+\:5a\:2\:b\:+\:2a\:2\:b$
$\lim_{x\to2}\left(\frac{x^2-13x+8}{x}\right)$
$2\cot^2\:=\:\frac{1}{sec+1}-\frac{1}{sec\:-1}$
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