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If sin^(4)alpha+4cos^(4)beta+2=4sqrt(2) ...

If `sin^(4)alpha+4cos^(4)beta+2=4sqrt(2) sin alpha cos beta, alpha, beta in [0, pi]`, then `cos(alpha+beta)-cos(alpha-beta)` is equal to

A

0

B

`-sqrt(2)`

C

`-1`

D

`sqrt(2)`

Text Solution

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The correct Answer is:
b
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