Cauchy Riemann Example Show that f(z) = cos hz is analytic find f'(z)

[@Chengunasi]

last part i will not be there , nice video by the way .....thanks a lot

[@koushalkrray9908]

Siniz=iSinhz then at last answer should be sinhz right because i will get cancelled

[@rohanbharadwaj6477]

Yes the answer is sinhz

[@fidhafathima6147]

Thank you ma'am

[@hernandezrojasgabrielivan9575]

thank u very much