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Number of solutions of equation cosx+cos...

Number of solutions of equation `cosx+cosy+cosz=-3`

A

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

B

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

C

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

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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