Question: The complex hyperbolic functions are defined as (a) Write out the formulas for their real and imaginary parts in terms of z = x +

The complex hyperbolic functions are defined as
The complex hyperbolic functions are defined as (a) Write out the

(a) Write out the formulas for their real and imaginary parts in terms of z = x + iy.
(b) Prove that cos i z = cos I z and sin i z = i sinhz.

e e-2 , sinh z

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