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If cos alpha+ cos beta =a sin alpha + si...

If `cos alpha+ cos beta =a` `sin alpha + sin beta =b` `alpha - beta = 2 theta ` then `(cos 3 theta)/ (cos theta)=`

A

1

B

`sqrt(3)`

C

`sqrt(3)/(2)`

D

2

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The correct Answer is:
B
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