Python3, Python Matplotlib, Numpy, Differential Calculus, Derivation.
Formula D=Zxx ∗ Zyy −( Zxy)2 It involves the second pure partial derivatives in product, subtracting the second mixed derivative squared Zxx #differentiate y1 with respect to x Zx = sy.diff(y1, x) #returns resulting expression in factored form #this matters to our specific problem and looking #for