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Question: find fxxy fyxy and explain why fxy has no local...

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Find fx(xy) fy(xy) and explain why f(xy) has no local extrema.

#16. f(xy)= y+y^2lnx

In Problems 9-16, find f(x, y) and f(x, y), and explain, using C Theorem 1, why f(x, y) has no local extrema. 9. f(x, y)4 5y 6 10. f(x, y) 10 2x 3y x2 11. f(x, y) 3.7 1.2x + 6.8y + 0.2y 12. f(x, y) x3-y2 + 7x + 3y + 1 14, f(x,y)-3x2-12xy + 12y2 + 8x + 9y-15 15. f(x, y)ye 3x 4y 16. f(x,y-y + y2inx
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