1.

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

Answer»

One solution if `x, y, x in [0, PI]`
One solution if `x, y Z in [0, 2 pi]`
Two solution if `x, y, z in [0, 2 pi]`
No solution if `x, y, z in [ 0, pi]`

Answer :A::B::D


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