I want to do following:
ArcTan[1/Sqrt[-1 + (4 Sqrt x^2)/(5 xc^2)]] /.4 Sqrt/5->a^2
I expect to have
ArcTan[1/Sqrt[-1 + x^2/(a^2 xc^2)]]
Mathematica cannot recognize 4 Sqrt/5 in expression.
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