The largest interval lying in (-pi//2, p...

The largest interval lying in `(-pi//2, pi//2)` for which `f(x) = 4^(-x^2) + cos^(-1) (x/2-1)+log (cos x)` is defined is

A

`[0,pi]`

B

`(-pi/2,pi/2)`

C

`[-pi/4,pi/2)`

D

`[0,pi/2)`

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The correct Answer is:

D

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