Number of solution of equation cos x + c...

Number of solution of equation cos x + cos y + cos z = - 3

A

One solution if `x, y, x in [0, pi]`

B

One solution if `x, y z in [0, 2 pi]`

C

Two solution if `x, y, z in [0, 2 pi]`

D

No solution if `x, y, z in [ 0, pi]`

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The correct Answer is:

A, B, D

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