The perpendicular bisector of a linesegment joing (1,5) and (4,6) cuts y-axis at
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A horizontal tangent line means the slope is zero, which means the change in y is zero. ... A vertical tangent means the slope is infinite and the change in x is zero. ... The gradient of the tangent drawn at any point on a curve is given by m=dy/dx=1-4x...............................
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