Given the functions f(x, y) = e- sin(x + y) and g(x, y) = e= cos(r+ y), which of the following is TRUE? a. f(x, y) = 9(x, y) b. f,(r, y) = 9(x, y) c. g-(r, y) = f(r, y) d. f.(r, y) = - fyz(x, y) а. b. С. O d.

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