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Math Help - Proving trig identities

  1. #1
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    Proving trig identities

    1/(1-cos x) +1/(1+cos x)=2 csc^2 x

    After getting the common denominator-->
    2/(1-cos^2 x)

    then,
    2/sin^2 x

    Now I know that 1/sin^2 x= csc^2 x, so

    2/sin^2 x=1/2 csc^2 x

    But I need 2 csc^2 x.....
    What do I need to do?

    Thanks in advance.
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  2. #2
    Lord of certain Rings
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    ............
    then,
    2/sin^2 x

    Now I know that 1/sin^2 x= csc^2 x, so
    2/sin^2 x=1/2 csc^2 x
    NO...! Why are you inverting the 2 along with sin?
    2/sin^2 x= 2 (1/sin^2 x) = 2 csc^2 x


    ...............
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  3. #3
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    omg. I don't know why I did that! I guess my brain function is ailing after doing 55 of these.

    Thanks so much!
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