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Show that wr = wn(1-2*damping^2)^-(1/2) is the resonant frequency for acceleration amplitude of an SDF system....

Show that wr = wn(1-2*damping^2)^-(1/2) is the resonant frequency for acceleration amplitude of an SDF system. I keep getting that the answer is

wr = wn (1-2*damping^2)^(1/2) since Ra = ((wr/wn)^2)*Rd, and Rd = 1/(2*damping*(1-damping^2)^.5)..

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