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Math Help - Simple - getting a common denominator

  1. #1
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    Simple - getting a common denominator

    i have - cosx/sin^2x + 1/sin^3x

    This is really elementary stuff i know... but i'm fairly sure these can be brought to a common denominator to add them properly. I just cannot for the life of me remember how to do it.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by NotEinstein View Post
    i have - cosx/sin^2x + 1/sin^3x

    This is really elementary stuff i know... but i'm fairly sure these can be brought to a common denominator to add them properly. I just cannot for the life of me remember how to do it.
    the "least" common denominator is \sin^3 x

    both denominators can go into it. it is a multiple of both and since it is equal to one, it is the "smallest"
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  3. #3
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    Quote Originally Posted by Jhevon View Post
    the "least" common denominator is \sin^3 x

    both denominators can go into it. it is a multiple of both and since it is equal to one, it is the "smallest"
    so would it be...

    (-cosx)(sinx)/sin^3x + 1/sin^3x ?
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by NotEinstein View Post
    so would it be...

    (-cosx)(sinx)/sin^3x + 1/sin^3x ?
    and you say you're not Einstein! Pfft! yes, now add those two
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