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If alpha, beta, gamma are three real num...

If `alpha, beta, gamma` are three real numbers, then
`cos^(2)(beta-gamma)+cos^(2)(gamma-alpha)+cos^(2)(alpha-beta)-2cos(beta-gamma)cos(gamma-alpha)cos(alpha-beta)` is equal to

A

0

B

1

C

`-1`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
b
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