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If alpha, beta , gamma are angles of a t...

If `alpha, beta , gamma` are angles of a triangle then the value of `(sin^(2) alpha + sin ^(2) beta+sin ^(2) gamma-2 cos alpha cos beta cos gamma)` is-

A

2

B

1

C

`-1`

D

`-2`

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The correct Answer is:
A
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