CVT4

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Verify the identity: \cos(iz) = \cosh(z)\,

\cos(iz)\, = \frac{e^{i(iz)} + e^{-i(iz)}}{2}
= \frac{e^{-z} + e^{z}}{2}
= \frac{e^{z} + e^{-z}}{2}
= \cosh{z}\,


Main Page : Complex Variables : Trigonometric Functions

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