1.

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

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`X^n+1/x^n=2cos (ntheta)`
`(x)/(y)+(y)/(x)=2cos(theta-varphi)`
`xy+1/xy=2cos(theta+varphi)`
NONE of these

Answer :A,B,C


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