$\lim_{x\to\infty}\frac{2x^2+3x}{x^3+x+1}$
$-\left(\frac{1}{2}\right)^{-2}$
$\frac{44}{4}$
$\int\left(-8sec^2x\right)dx$
$49x^2-9$
$36x^2\:+\:36x\:+\:8$
$\tan a+\cot a=\sec a\cdot\cos a$
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