Question: Formulas for hyperbolic functions Show that cosh (z 1 + z 2 ) = cosh z 1 cosh z 2 + sinh z 1 sinh

Formulas for hyperbolic functions

Show that

cosh (z1 + z2) = cosh z1 cosh z2 + sinh z1 sinh z2
sinh (z1 + z2) = sinh z1 cosh z2 + cosh z1 sinh z2

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