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i) Find the equation of tangent and normal to the curve x/3 + y/3 = 2 at (1,1). [5] ii) The volume of the

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i) Find the equation of tangent and normal to the curve x/3 + y/3 = 2 at (1,1). [5] ii) The volume of the cube is increasing at a rate of 9 cubic cm/sec. How fast is the surface area increasing when the length of an edge is 10 cm. [5]

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