which requires z ( = x + i ⢠y ) to lie between the two rectangular hyperbolas given by
§4.38(ii) DerivativesIn the following equations square roots have their principal values.
4.38.9 d d z â¡ arcsinh â¡ z = ( 1 + z2 ) â 1 / 2 . 4.38.10 d d z â¡ arccosh â¡ z = ± ( z2 â 1 ) â 1 / 2 , â â¡ z â· 0 . 4.38.11 d d z â¡ arctanh â¡ z = 1 1 â z2 . 4.38.12 d d z â¡ arccsch â¡ z = â 1 z ⢠( 1 + z2 ) 1 / 2 , â â¡ z â· 0 . 4.38.13 d d z â¡ arcsech â¡ z = â 1 z ⢠( 1 â z2 ) 1 / 2 . 4.38.14 d d z â¡ arccoth â¡ z = 1 1 â z2 . §4.38(iii) Addition FormulasThe above equations are interpreted in the sense that every value of the left-hand side is a value of the right-hand side and vice-versa. All square roots have either possible value.
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