f(x)= cosec^(-1)[1+sin^(2)x], where [*] ...

`f(x)= cosec^(-1)[1+sin^(2)x]`, where `[*]` denotes the greatest integer function.Then f(x) equal to (a){ π/2 ,cosec^ (−1) 2}(b) π/2 (c)cosec^(-1) 2 (d)none of these

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