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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-sqrt(5))/(2), (1+sqrt(5))/(2)]`

B

`((sqrt(5)-1)/(2), (sqrt(5)+1)/(2))`

C

`(-1//2, 1//2)`

D

none of these

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The correct Answer is:
A
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