ISRO Mechanical & Aerospace 2020 - Question 51

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cos(z) can be expressed as

  • A. 1/2 (e^(iz) + e^(-iz))
  • B. 1/2 (e^(iz) - e^(-iz))
  • C. 1/(2i) (e^(iz) + e^(-iz))
  • D. 1/(2i) (e^(iz) - e^(-iz))

Answer: A. 1/2 (e^(iz) + e^(-iz))

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