If 2costheta=x+(1)/(x), then find the value of 2cos^(2)theta. – InterviewSolution

1.	If 2costheta=x+(1)/(x), then find the value of 2cos^(2)theta.
Answer» a) `(1)/(2)(X^(2)+(1)/(x^(2)))+1` b) `(x^(2)+(1)/(x^(2)))-1` C) `(3)/(x^(3))` d) 1 Answer :A

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