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how to solve thses question? Question 3 A surface is given by z = x2 - 2xy + yz (i) Find the equation of the

how to solve thses question?

Question 3 A surface is given by z = x2 - 2xy + yz (i) Find the equation of the tangent plane to the surface at x = a, y = 2a. (7 marks) (ii) For what value of a is the tangent plane parallel to the plane 4x - 4y - z = 4.

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