i have a problem in my engineering maths which says as follows:(adsbygoogle = window.adsbygoogle || []).push({});

show that if z is a complex number then

2 cos (x) = z + 1 / z

and 2 j sin (x) = z - 1/z

given that cosh (jy) = cos (y) and sinh (jy) = j sin(y)

I can solve the problem without using the hyperbolics but that last statment induces that hyperbolics should be involved.

does anyone know how to use the hyperbolics to solve this problem?

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# Homework Help: Proving complex with hyperbolic

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