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ccomplex-numbersexponential

Computing e^(-j) in C

I need to compute imaginary exponential in C.

As far as I know, there is no complex number library in C. It is possible to get e^x with exp(x) of math.h, but how can I compute the value of e^(-i), where i = sqrt(-1)?

Solution

  • Note that exponent of complex number equals:

    e^(ix) = cos(x)+i*sin(x)

    Then:

    e^(-i) = cos(-1)+i*sin(-1)