Let $f(x) = \cos \sqrt {x,} $ then which of the following is true
Let $f(x) = \cos \sqrt {x,} $ then which of the following is true
- A
$f(x)$ is periodic with period $\sqrt 2 \pi $
- B
$f(x)$ is periodic with period $\sqrt \pi $
- C
$f(x)$ is periodic with period $4{\pi ^2}$
- D
$f(x)$ is not a periodic function
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