[Python] Can I use SciPy.optimize curve_fit to fit a data set to a polynomial equation of the...

I have a data set (Angle values .vs. energy). I want to fit the data with the above equation and retrieve the constants K2, K3, K4, x0. Is this possible and if yes is the above form usable as it is to pass it as a function to the curve fit or I need to expand the equation to its simplest polynomial form?

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