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If k=(1-sinalpha)(1-sinbeta)(1-singamma...

If `k=(1-sinalpha)(1-sinbeta)(1-singamma)=(1+sinalpha)(1+sinbeta)(1+singamma)`, then the value of k is:

A

`+-cos alpha cos beta cos gamma`

B

`+-sin alpha sin betasin gamma

C

`+-sin alpha cos beta cos gamma`

D

`+- sin alpha sin beta cos alpha`

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The correct Answer is:
A
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