I remember seeing hyperbolic trigonometric functions (sinh, cosh, tanh, etc.) in my precalculus textbook back in high school and see them today in my calculus textbook. However, I have not had a formal introduction to them in my education. This may just be with me, but I would like to know if there is a reason as to why they are avoided.
2026-03-29 09:21:50.1774776110
Why are hyperbolic trigonometric functions avoided in (my) high school and early post-secondary school?
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One reason may be that the input of hyperbolic functions is often interpreted as the area partially bounded by a hyperbolic curve, while regular trigonometric functions take an angle as an input. Even though hyperbolic functions have lots of nice properties, teachers may not see them as as important as regular trigonometric functions, since the area is useful only in specific scenarios, for example bridge construction.