In geometry, the tangential angle of a curve in the Cartesian plane, at a specific point, is the angle between the tangent line to the curve at the given point and the x-axis. (Some authors define the angle as the deviation from the direction of the curve at some fixed starting point.
In geometry, the tangential angle of a curve in the Cartesian plane, at a specific point, is the angle between the tangent line to the curve at the given point and the x-axis. (Some authors define the angle as the deviation from the direction of the curve at some fixed starting point.
Source: Wikipedia "Tangential angle" · CC BY-SA 4.0
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