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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