If the equation "sin" theta ("sin" theta...

If the equation `"sin" theta ("sin" theta + 2 "cos" theta) = a` has a real solution, then the shortest interval containing 'a', is

A

`[1/2,infty)`

B

`(-infty,-1/2]`

C

`[-1,1]`

D

`[-1/2,1/2]`

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The correct Answer is:

a

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