Question: Help evaluatting and fitting curve?

So Im doing a curve againist data plots for angular freq,

Ive reached the stage where im trying to evaluate the function,

ive put

>fit :=eval(f(x),R[2]);

 

where R[2] is the the values for the constants, in the function

F/sqrt(m^2*(omega^2-omega_0^2)^2+b^2*omega^2

which is also defined as f(x)


however maple is giving me the answer as 1.00048772104451,

where as I expect an answer of well the above function but with the desired constants given their

correct values, does anyone know why this does not work?

 

Many thanks in advance

 

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