Question: 4. (a) If x + y = 25, find dx 33 dy by implicit differentiation. (b) Find an equation of the tangent to the

4. (a) If x + y = 25, find dx 33 dy

4. (a) If x + y = 25, find dx 33 dy by implicit differentiation. (b) Find an equation of the tangent to the circle x + y = 25 at the point (3, 4). [3] [3]

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