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P= Sqrt[(mu)F].(omega)^2.(A)^2

It reduces this from: P=k^2.omega^2.F.A^2.(sin(kx-omega.t)^2

Where all symbols are the standard ones in dealing with waves.

Could someone please go thru how it got from 2 to 1? I can't see the logic. I'm sure its obviously just basic math I am overlooking, but there may be a misprint in the derivation.

Cheers!