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Math Help - Trigonometric form of a number

  1. #1
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    Trigonometric form of a number

    Okay, I don't know how to find just theta either on my calculator or just by hand.

    The problem was 5+2i.

    I get the square root of 29.

    I get 2/5.

    I have to turn tan(2/5) into approximately 0.38. That's all the help I need really.
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  2. #2
    Super Member bigwave's Avatar
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    tan(2/5) \ \approx\ .422

    the calculator has to be set to "approximate" in the mode menu
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  3. #3
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    Quote Originally Posted by A Beautiful Mind View Post
    Okay, I don't know how to find just theta either on my calculator or just by hand.

    The problem was 5+2i.

    I get the square root of 29.

    I get 2/5.

    I have to turn tan(2/5) into approximately 0.38. That's all the help I need really.
    The arctangent of (2/5) = 21.801 degrees = 0.3805 radians

    The calculator should have a DRG button
    [DRG] --> Degrees_Radians_Grads
    Set the mode to Rad
    & then take the inverse of tan(2/5)
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