Hyperbolic trig function, the input is twice of the area

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Hyperbolic trig function, introduction: https://youtu.be/aC5cYc7XhIs

The complex relationship between regular trig and hyperbolic trig functions: https://youtu.be/RPW7ohLbqc8

cosh is the even part, sinh is the odd part of e^x, https://youtu.be/oLZoGEcJ2YE

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