1.

`cosec^(-1)(cosx)` is defined ifA. `x in [-1,1]`B. `x in R`C. `x=(2n+1)(pi)/(2), n in z`D. `x=n pi , n in z`

Answer» We know that `cosec^(-1)x` is defined for
`x in(-infty,-1]cup[1,infty)` Therefore `cosec^(-1) (cosx)` is defined for
`cosx=px1rarr x n pi n in z`


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