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a flat plane with two perpendicular axes (x-axis and y-axis). The position of any point on the plane can be described as an ordered pair of coordinates (x1; y1).
the first non-zero digit in a decimal fraction. It can appear before or after the decimal comma...
a periodic function is one that repeats after a given interval. The period is therefore the...
the limit of the average gradient as the change in x tends towards zero.