How can i write d/dy(d/dx(f(x,y))*delta x*delta y in terms of d/dx(f(x,y))*delta x and d/dy(f(x,y))*delta y. Even an approx value will work

How can i write d/dy(d/dx(f(x,y))*delta x*delta y in terms of d/dx(f(x,y))*delta x and d/dy(f(x,y))*delta y. Even an approx value will work

-4/9=3/n __/(decimal)

list seven rules about Congruence that apply only to Angles.

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