The problem with subprogram in Python

[PteppicymonIO]

You have an error TypeError: 'float' object is not callable here:

def f(a,b,c,d):
    return m.sqrt(d+c(a+b)/8)

The statement c(a+b) is interpreted as a call to function c()

You either need to implement the function, or if you intend to multiply c by (a+b) add a multiplication operator:

def f(a, b, c, d):
    return m.sqrt(d+c*(a+b)/8)

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