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I was wondering when was the sin function (I suppose cosine too) first introduced or defined and what was the need for?

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    Hello, and thanks for asking this question. However, this question is probably better suited for mathhistory, but I am not well informed as to the rules there, though. See [here](http://hsm.stackexchange.com/). – 2017-02-07
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    @S.C.B. you're right and I put a math-history tag to it. Or do you mean there is another stackexchange forum maybe?? – 2017-02-07
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    Yeah, I linked it in my comment. Click on http://hsm.stackexchange.com/ – 2017-02-07
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    @S.C.B. Okay, I found the History of Science and Mathematics. I'll maybe post it there – 2017-02-07
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    Yeah, but be sure to check what kind of questions are suited there. – 2017-02-07
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    @S.C.B. Okay :-) – 2017-02-07
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    If you simply google "trig functions history" you'll get plenty of relevant info. – 2017-02-07
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    A quick research mainly led me to origins of the *name* to exist in its Latin from at least since the 12th century, being a translation from Arabic (and that again a translation from India) – 2017-02-07
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    See posts : [History of sine function](http://hsm.stackexchange.com/questions/3414/history-of-sine-function) as well as [How were derivatives of trigonometric functions first discovered ?](http://hsm.stackexchange.com/questions/3174/how-were-derivatives-of-trigonometric-functions-first-discovered) – 2017-02-07
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    See [Trigonometric functions](http://www-history.mcs.st-andrews.ac.uk/HistTopics/Trigonometric_functions.html) in the MacTutor History of Mathematics archive. – 2017-02-07

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