parameters directly in the function

Hello!!!

I'm Waléria....i have a question about a functions....i have a
function bellow:

y.append(pow(form.cleaned_data['Pinc'],2)/(2*(pow(2*pi*v,
2)))*((pow(2,2)*pow(form.cleaned_data['Qe'],2)))/
(pow(form.cleaned_data['fp'],2))*(pow(form.cleaned_data['df'],2)))

I need to pass this parameter (2 * pi * x) directly on the function
but displays an error: unsupported operand type(s) for /: 'Decimal'
and 'float'

As i do?

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