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2.Parts a) and b) are not related. a) Verify that the assumptions and conclusion of Clairautís...

2.Parts a) and b) are not related.

a) Verify that the assumptions and conclusion of Clairautís theorem holdfor the following function:

u(x,y)=ln(x+2y)

b) Find gxyz. If you use Clairauts theorem you must determine the set of points where it is valid:

g(x,y,z)= sqrt(1+xz) + sqrt(1-xy)

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