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 Linear equation through two points      Derives the linear equation through two points, and calculates the distance and slope between two points.
 Linear equation with two intercepts      Calculates the linear equation with x-intercept and y-intercept and the slope.
 Coordinates of the intersection of two lines      Calculates the coordinates and acute cross angle of the intersection of two lines.
 Area of the triangle surrounded with three points      Calculates the area and boundary length of the triangle surrounded with three points.
 Rotation of axes      Calculates the new coordinates after rotation of axes.
 Transformation to Polar coordinates      Transforms Cartesian coordinates into polar coordinates.
 Transformation to Cartesian coordinates      Transforms polar coordinates into Cartesian coordinates.


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