x' y 2x6+ y2 (x, y)→ (0, 0) along any straight line y = mx, or along 38. (a) Show that the value of approaches 0 as any parabola y = kx². x'y does not exist by letting lim (x,y)→ (0,0) 2x6 + y2 (x, y)→ (0, 0) along the curve y = (b) Show that = x'.

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