Could you please help me to
answer question 62?
Show transcribed image text True or False? In Exercises 61-64, determine whether the statement is true or false. If it is false, explain why or give an example that shows it is false. 61. If,f(x, y)-、/1-r- y, then Duf(0,0) 0 for any unit x-V vector u 62. If f(x, y) = x + y, then-l s D"f(x, y) s l. 63. If D.fx, y) exists, then D.fx, y)Df, y).
True or False? In Exercises 61-64, determine whether the statement is true or false. If it is false, explain why or give an example that shows it is false. 61. If,f(x, y)-、/1-r- y, then Duf(0,0) 0 for any unit x-V vector u 62. If f(x, y) = x + y, then-l s D"f(x, y) s l. 63. If D.fx, y) exists, then D.fx, y)Df, y).
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