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If `sin alpha , sin beta, sin gamma ` are in A.P. and `cos alpha, cos beta, cos gamma` are in G.P. then `(cos^(2)alpha+cos^(2)gamma - 4 cos alpha cos gamma)/(1-sin alpha sin gamma)=`

A

`-2`

B

`-1`

C

0

D

2

Text Solution

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The correct Answer is:
a
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