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9. (a) If x +y =25, find dy dx (b) Find the equation of the tangent to the circle in part (a) at the point

9. (a) If x +y =25, find dy dx (b) Find the equation of the tangent to the circle in part (a) at the point (3, 4). d (a) dx (x2 + y) = 25 = d dx ( x ? ) + d d dx (12 dx (25). ...... (b ) y - y, = m (x- x ) =

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