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3. Let z = f(x, y). If df = (ycos(xy) + 2x)dx + (xcos(xy) + 3y2)dy, and f (0,1) = 1, a) find the equation
3. Let z = f(x, y). If df = (ycos(xy) + 2x)dx + (xcos(xy) + 3y2)dy, and f (0,1) = 1, a) find the equation of the tangent plane to the surface at (0, 1). b) Calculate fxy
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