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If cos2theta+alphasintheta=2alpha-7 has ...

If `cos2theta+alphasintheta=2alpha-7` has a solution, then

A

`alpha in [-2, 4]`

B

`alpha in [-6, -2]`

C

`alpha in [6, 8]`

D

`alpha in [2, 6]`

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The correct Answer is:
D
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