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(( cos alpha - cos 3 alpha ) ( sin 8 alp...

`(( cos alpha - cos 3 alpha ) ( sin 8 alpha + sin 2 alpha ))/( ( sin 5 alpha - sin alpha ) ( cos 4 alpha - cos 6 alpha ))=`

A

1

B

`-1`

C

2

D

`-2`

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The correct Answer is:
A
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