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If x+1/x=2cos alpha,y+1/y=2cos beta, the...

If `x+1/x=2cos alpha,y+1/y=2cos beta,` then `xy+(1)/(xy)=`

A

`cos(pm alpha pm beta)`

B

`2cos(pm alpha pm beta)`

C

`2sin(pm alpha pm beta)`

D

`sin(pm alpha pm beta)`

Text Solution

Verified by Experts

The correct Answer is:
B
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