Question: Check that the point ( - 1 , 1 , 2 ) lies on the surface given below. cos ( x + y ) =

Check that the point (-1,1,2) lies on the surface given below. cos(x + y)= exz +2(a) View the surface as a level surface for a function f(x,y,z). Find a vector normal to the surface at (-1,1,2).

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