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फलन f(x) =cos^(-1)(1/(e^(x) + e^(-x))) ...

फलन `f(x) =cos^(-1)(1/(e^(x) + e^(-x)))` का परिसर है-

A

`(0,pi)`

B

`[pi/6, pi/2)`

C

`[pi/3, pi/2)`

D

`[pi/2, (2pi)/3)`

लिखित उत्तर

Verified by Experts

The correct Answer is:
C
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