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Let cos alpha + cos beta =2 and sinalpha...

Let `cos alpha + cos beta =2` and `sinalpha + sinbeta =0`, where `0 le alpha le 90^(@), 0 le beta le 90^(@)`. What is the value of `cos2alpha - cos 2beta` ?

A

0

B

1

C

2

D

Cannot be determined due to insufficient data

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