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cos(alpha-beta)=1a n dcos(alpha+beta)=l/...

`cos(alpha-beta)=1a n dcos(alpha+beta)=l/e ,` where `alpha,betamu in [-pi,pi]` . Number of pairs of `alpha,beta` which satisfy both the equations is 0 (b) 1 (c) 2 (d) 4

A

0

B

1

C

2

D

4

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The correct Answer is:
D
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