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General solution of the equation, cos ...

General solution of the equation,
`cos x cdot cos 6x = -1` is x =

A

has 50 solutions in ` [0, 100 pi]`

B

has 3 solutions in ` [ 0, 3 pi] `

C

has even number of solutions in ` ( 3 pi , 13 pi ) `

D

has one solution in ` [ (pi)/(2) , pi] `

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The correct Answer is:
A, C, D
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