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Suppose alpha, beta in R, and let E=sin^...

Suppose `alpha, beta in R`, and let `E=sin^(2)(alpha+beta)+sin^(2)alpha+sin^(2)beta-2cos alpha cos beta cos (alpha+beta)` then E is equal to :

A

0

B

1

C

2

D

`2cos alpha cos beta`

Text Solution

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The correct Answer is:
c
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