If $\lim _{x \rightarrow 0}\left(\frac{\cos 4 x+a \cos 2 x+b}{x^4}\right)$ is finite, then the values of $a,…

If $\lim _{x \rightarrow 0}\left(\frac{\cos 4 x+a \cos 2 x+b}{x^4}\right)$ is finite, then the values of $a, b$ are respectively :
  1. $5,-4$
  2. $-5,-4$
  3. $-4,3$
  4. 4,5

Solution

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Asked in: AP EAMCET 2006

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