Question: Is there a command to get errors from fit parameters and how to fit for certain particular distributions?

Hi everyone, I'm studying physics at college and we have to do lab reports. Of course we have to fit data sets. They only taught us how to calculate errors of the parameters of lineaer distributions.

Unforutnately I have to fit points that follow these functions:

y=a+b*x^c

y=d+a*x/(sqrt(b*x^2+c^2))

First of all, which command do I use to fit for the second function? (Its the formula of abs(Vout/Vin) in function of the frequence in RC circuits)

I know for the first one there's the PowerFit command.

Also, is there a command that returns the errors for the variaous fit parameters? (i.e. a,b,c,d)

Or at least, someone knows the methods and formulas to find them?

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