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Thread: trig help

  1. #1
    Senior Member madfiNch's Avatar
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    trig help

    omg. I take 8 months off college to work a co-op and I've forgotten everything I've ever learned. Please help me. I feel like such a moron, but I've been trying to figure this out for a long time now.

    I'm supposed to convert an equation in the form of y=cos(at+b) into the form of RE{Be^(jwt)**.
    I get how to do that part. The problem is that I can't for the life of me figure out how to combine the real parts of the equation into one cosine function. It's in this form:

    Acos(bt+c) + sin(bt)

    I know I need to get it all into cosine, but I dunno how..? I know I'm going to feel stupid when I figure it out, but I've spent way too long on this already..
    Thanks.

  2. #2
    Hazardous Taerom's Avatar
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    Math with letters?! AAAHHHH!! *head explodes*

  3. #3
    cab horn
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    Quote Originally Posted by Taerom View Post
    Math with letters?! AAAHHHH!! *head explodes*
    This post matches said avatar perfectly
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  4. #4
    Cries on hills supton's Avatar
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    I think you're looking for Euler's identity:
    http://en.wikipedia.org/wiki/Euler's_identity
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  5. #5
    Life is good RonH's Avatar
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    Chebyshev's cube root looks pretty confusing.

    My son calls me about once a month needing help with college algebra. Now he's starting calculus. I tell him it's been toooooo many years since I've used or studied that stuff. Then I send him to Wikipedia.
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