What is the purpose, if any, of secant, cosecant, and cotangent? I’m an engineering student so I use sine, cosine, and tangent a lot, but almost never the other 3. Creating a new trig function just to be the reciprocal seems to be a bit redundant.
Well, the ratio of the hypotenuse to the adjacent side is always going to be the same for a particular angle. So you gotta name it something. And Inv Cos means something else.
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