- In(a°y*) + x2 Consider z as a function of the variables x, y which is denoted by z and let P(1,-1) be a point. Consider further the vectors u = (a, B), w = (-a, B), such that I|"|l =V3. 79/73 97/73 If Duz(P) = 73 Duz(P) : and determine: %3D 73 The value of B:

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