Neile parabola

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Semicubical parabola — Semicubical parabolas for different values of a. In mathematics, a semicubical parabola is a curve defined parametrically as The parameter can be removed t … Wikipedia
Arc length — Determining the length of an irregular arc segment is also called rectification of a curve. Historically, many methods were used for specific curves. The advent of infinitesimal calculus led to a general formula that provides closed form… … Wikipedia

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