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If 2cos theta=x+1/x and 2cosvarphi=y+1/y...

If `2cos theta=x+1/x and 2cosvarphi=y+1/y` , then

A

`x^n+1/x^n=2cos (ntheta)`

B

`(x)/(y)+(y)/(x)=2cos(theta-varphi)`

C

`xy+1/xy=2cos(theta+varphi)`

D

None of these

Text Solution

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The correct Answer is:
A,B,C
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