1. Sketch in the xy - plane the domain of each function : (a) ƒ (x, y) = (Vx – 1+ Vy +1) · In (x² + y? – 4) exy (b) g (x, y) %3| 2x + 5y (c) h (x, y) = sin- (x) + tan-1 (y).

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