Variable q4 has an incorrect value.
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the original question states assign g(x,y)=xy/x^2+y^2 and calculate fyxx(1.2,3.8) (tripe derivative!) and assign the result to q4
syms x y
g(x,y)=x*y/(x^2=y^2)
q4=subs(diff(diff(g(x,y),y),x),{x,y},{1.2,3.8})
采纳的回答
syms x y
g(x,y) = x*y/(x^2+y^2)
dyxx = diff(diff(diff(g(x,y),y),x),x)
q4 = subs(dyxx,{x,y},{1.2,3.8})
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