Why do we need so many trigonometric definitions? – math.stackexchange.com

Why do we need so many trigonometric definitions? – math.stackexchange.com

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Examples $$\sec(x) = \dfrac{1}{\cos(x)}$$ $$\cot(x) = \dfrac{1}{\tan(x)}$$ There are many more out there, but why do we need definitions that can be written with just $\sin , \cos ,\tan $ etc. in ...

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