I’d reccoment you use a mathematical forum for this question. I can not even type a readable formula in here..
W= S xy dx + S xy dy just does not work. You’d need power of two, the fitst part being 1/2 times x^2 times y and the borders from where to which you want to integrate..
Basically: you integrate partially, the first part with the dx the power of x gets added one and in front you put (1/the power of x+1). The second works the same but with y.
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