hyperbolic angle
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hyperbolic function
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hyperbola
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measure
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Grégoire de Saint-Vincent
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hyperbolic sector
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geometry
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Leonhard Euler
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area
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International Standard Book Number
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trigonometry
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angle
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theory of relativity
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speed of light in vacuum
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logarithm
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real number
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Wayback Machine
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integral
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Nikolai Ivanovich Lobachevsky
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Euler's number
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Euclidean geometry
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