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Math Help - Exponential to Polar form help please

  1. #1
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    Exponential to Polar form help please

    guys, I just cant understand this.. the question is :

    express e^-4-2j in polar form, the answer to the question is given which is :

    e^-4-2j = e^4 cjs(-2) = 0.018 cjs (-114.6 degree) = 0.018 angle -114.6

    my question is I don't know how he got -114.6 degree's, the 0.018 is e^4 and I thought that the -114.6 is 0.018(cos(-2) + sin(-2) but i dont get the same answer =S, help please.

    regards
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  2. #2
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    The minus 2 is minus 2 radians. Just convert it to degrees.

    cjs(-2) is an abbreviation for \cos(-2)+j\sin(-2).
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