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    honeybear101's Avatar
    honeybear101 Posts: 7, Reputation: 1
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    #1

    Oct 3, 2010, 03:00 PM
    Establishing Identity
    Establish this Identity:
    (Cos(x)-Sin(x))^2+2Sin(x)Cos(x)=1
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Oct 3, 2010, 09:53 PM

    First, expand the brackets.

    Then, cross out some things.

    Then, use:



    And you'll be done! :)

    Is that okay?
    honeybear101's Avatar
    honeybear101 Posts: 7, Reputation: 1
    New Member
    		  
    #3

    Oct 3, 2010, 10:07 PM
    LOL! That was so easy... Thank you!
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Oct 3, 2010, 10:21 PM

    You're welcome :)
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