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

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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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
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