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What does the hyp checkbox do on calculators (for example on the Microsoft Windows calculator)?

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Is there a "help" feature on that calculator? – Gerry Myerson Jun 18 '11 at 0:24

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It's used to select hyperbolic functions (i.e. hyperbolic sine, cosine).

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sin becomes sinh and so on. If you haven't heard of hyperbolic functions, and you haven't studied calculus yet, then just wait to find out about it. If you have studied calculus, but your instructor skipped that material, then you are the loser because of it: you my have to pick it up in engineering or physics courses, or other math courses which assume you know it. – GEdgar Jun 17 '11 at 17:48

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