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let-z-C-prove-that-cosz-ch-iz-and-sinz-sh-iz-




Question Number 35219 by abdo.msup.com last updated on 16/May/18
let z ∈C  prove that  cosz =ch(iz) and sinz=sh(iz)
$${let}\:{z}\:\in{C}\:\:{prove}\:{that} \\ $$$${cosz}\:={ch}\left({iz}\right)\:{and}\:{sinz}={sh}\left({iz}\right) \\ $$

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