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point 3 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) = ди - 22 и
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point 3 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) = ди - 22 и
point 3 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) = ди - 22 и ахду = дуг f(x,y) + Ф(x,y), then show that f(x,y) = i (+²3+ 2xy y + y²331) - 4 (xã÷ + y?»).