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Math Help - [SOLVED] Two different complex answers

  1. #1
    Junior Member Evales's Avatar
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    [SOLVED] Two different complex answers

    When try to find a complex number in rectangular form there are two ways I do it.

    A. Put it in exponential form and let my calculator do it.

    B. Use:
    r cis x = r cos x + ir sin x

    Now with \sqrt{3}cis3 I get two different answers

    A. -1.7147 + 0.2444i

    B. 1.7297 + 0.0906i

    Which is right? Is my rule for B wrong?
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  2. #2
    Flow Master
    mr fantastic's Avatar
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    Quote Originally Posted by Evales View Post
    When try to find a complex number in rectangular form there are two ways I do it.

    A. Put it in exponential form and let my calculator do it.

    B. Use:
    r cis x = r cos x + ir sin x

    Now with \sqrt{3}cis3 I get two different answers

    A. -1.7147 + 0.2444i

    B. 1.7297 + 0.0906i

    Which is right? Is my rule for B wrong?
    A. is the correct answer.

    You got the wrong answer using method B. because your calculator is in degree mode. It needs to be in radian mode.
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