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The equation a "cos" x - "cos" 2x = 2a-7...

The equation `a "cos" x - "cos" 2x = 2a-7` passesses a solution if

A

`k lt 3`

B

`k lt 2`

C

`k gt3`

D

`2 le k le 6`

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The correct Answer is:
D
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