Examine the function for relative extremum and saddle point  (a) f(x; y) = x2 − y2 − x − y  (b) f(x; y) = x2 - 3xy − y2

Advanced Engineering Mathematics
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ISBN:9780470458365
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Chapter2: Second-order Linear Odes
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2. Examine the function for relative extremum and saddle point

 (a) f(x; y) = x2 − y2 − x − y

 (b) f(x; y) = x2 - 3xy − y2

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