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# cosh(arcsinh)?? watch

1. So, I know that cos(arcsin) = (1-x^2)^1/2 but I need to know what cosh(arcsinh) is and am assuming that it's not the same thing.
Couldn't see it online anywhere, does anyone know?
Oh sorry I think its actually
sinh(arccos x) I need but if you know both that'd be great
Thanks
2. just use the identity cosh^2 x - sinh^2 x = 1. (Will always be the positive square root in either the cosh(arsinh ) case or sinh (arcosh) case as cosh is always positive, and arcosh is defined as the positive root).
3. so my answer for sinh(arccosh x) is sqrt(x^2 - 1)?
4. yes

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