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Math Help - product and quotient of cos and sin

  1. #1
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    Question product and quotient of cos and sin

    I have the quantities 2(cos pi/3 + i sin pi/3) and 4(cos pi/4 + i sin pi/4) and am looking to see if I have the correct product and quotient respectively.
    I come up with:
    8(cos 7pi/12 + i sin 7pi/12) and 1/2(cos 7pi/12 + i sin 7pi/12)
    correct or not quite? Thanks for the help in advance!
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  2. #2
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    How did you get these answers?

    Did you use these methods Complex numbers : De Moivre's theorem : Multiplication using polar form ?
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  3. #3
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    sin and cos

    yeah something like that...
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