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"cosec"^(-1)(cosx) is real , if :...

`"cosec"^(-1)(cosx)` is real , if :

A

`xepsilon[-1,1]`

B

`xepsilonR`

C

`x` is an odd multiple of `(pi)/2`

D

`x` is a multiple of `pi`

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The correct Answer is:
D
NA
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