Question: Show, by reference to a figure, that the angle between the tangents to two curves at a point of intersection may be found from

Show, by reference to a figure, that the angle β between the tangents to two curves at a point of intersection may be found from the formula tan -tan tan B= 1+ tantan i (6)

When will the two curves intersect at right angles?

tan -tan tan B= 1+ tantan i (6)

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