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If the angle between the vectors veca=ha...

If the angle between the vectors `veca=hat i+(cos x)hat j+hat k` and `vec b=(sin^2 x-sin x)hat i-(cos x)hat j+(3-4sin x)hat k` is obtuse and `x in (0,pi/2)`, then the exhtuse and austive set ofvalues of 'x' is equal to (A) ` x in (0,pi/6)` (B) ` x in (pi/6,pi/2)` (C) ` x in (pi/6,pi/3)` (D) ` x in (pi/3,pi/2)`

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