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Math Help - complex numbers - product of polar forms

  1. #1
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    complex numbers - product of polar forms

    perform the operation and leave in trigonometric form:

    (cos 5+i sin 5)(cos 20+i sin 20)
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  2. #2
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    Quote Originally Posted by kassums17 View Post
    perform the operation and leave in trigonometric form:
    (cos 5+i sin 5)(cos 20+i sin 20)
    At least tell us what you do not understand about this.
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  3. #3
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    how do you find the cos of 5 degrees and the cos of 20 degrees?
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  4. #4
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    Quote Originally Posted by kassums17 View Post
    how do you find the cos of 5 degrees and the cos of 20 degrees?
    There is no need to bother with that.
    What does \left[ {r(\cos (\phi ) + i\sin (\phi ))} \right]\left[ {s(\cos (\theta ) + i\sin (\theta ))} \right] = ~?
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