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= 6. If f(x,y) and ф(x,y) are homogeneous functions of x, y of degree 6 and 4, respectively and u(x,y) = и ди f(x,y) + Ф
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= 6. If f(x,y) and ф(x,y) are homogeneous functions of x, y of degree 6 and 4, respectively and u(x,y) = и ди f(x,y) + Ф
= 6. If f(x,y) and ф(x,y) are homogeneous functions of x, y of degree 6 and 4, respectively and u(x,y) = и ди f(x,y) + Ф(x,y), then show that f(x,y) = i (120^1 + 2xy 21, +y²03u ) - i (x +y). (x 1 дуг дх