Shows that f (z) = z [cos (x) cosh (y) -isin (x) sinh (y)] it is an integer function. Find the derivative of f (z) and evaluate it at z = i
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![Shows that
f (z) = z [cos (x) cosh (y) -isin (x) sinh (y)]
it is an integer function. Find the derivative
of f (z) and evaluate it at z = i](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4b6bbfcf-d76f-4ff8-a1d7-9871d5929fb8%2Ff29e5734-968c-4f7a-8788-52fb7e773a37%2Ffromsdi_processed.jpeg&w=3840&q=75)
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