Equation cos 2x+7=a(2-sin x) can have a ...

Equation `cos 2x+7=a(2-sin x)` can have a real solution for

A

all values of a

B

`a in [2,6]`

C

`a in (-oo, 2)`

D

` a in (0,oo)`

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The correct Answer is:

B

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