The equation k cos x-3sinx=k+1 is solvab...

The equation `k cos x-3sinx=k+1` is solvable only if

A

`k in (-oo, 4)`

B

`k in (-oo, 4]`

C

`k in (4, oo)`

D

`k in [4, oo)`

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The correct Answer is:

B

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