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derive the following formulas, using formulas you know: a) cosz=(e^iz + e^-iz) / 2 b) sinz=(e^iz - e^-iz) / 2i

derive the following formulas, using formulas you know:

a) cosz=(e^iz + e^-iz) / 2

b) sinz=(e^iz - e^-iz) / 2i

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