Hey ive been asked to find the second deriviative of arctanh x, what on earth is arctanH???? Ive never encountered it before.
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Originally Posted by anothernewbie Thanks, I understand the arctan part, its just the H, are they using this as another variable ie, ? No, it is the "area hyperbolic tangent" (or inverse hyperbolic tangent) function, the inverse function of the hyperbolic tangent function. Cf. here (and there)
Ah super thanks for that i'll have a try and see how i get on with it.
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