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For any point (x, y) of the differential curve, construct the auxiliary triangle with vertices (x, y), (x, 0) and (x − 1, 0). The hypotenuse of this right triangle intersects the X-axis making an angle the value of whose tangent is y. This hypotenuse is parallel to the tangent line of the integral curve at (X, Y) that corresponds to (x, y).
