Limit Laws

If limxcos(arctan(x22))f(x)=π\displaystyle \lim_{x\to\infty}\frac{\cos\left(\arctan\left(x^2-2\right)\right)}{f\left(x\right)}=\pi, then limxcos(f(x))\displaystyle \lim_{x\to\infty}\cos\left(f\left(x\right)\right) is
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