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if (1+cosalpha)(1+cosbeta)(1+cosgamma)=(...

`if (1+cosalpha)(1+cosbeta)(1+cosgamma)=(1-cosalpha)`
`(1-cosbeta)(1-cosgamma)` then show that each side= `pm sin alpha sin beta singamma`

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The correct Answer is:
Therefore, each side of the given relation=k= `pm sin alpha sin beta sin gamma`
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