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    Gagereesman's Avatar
    Gagereesman Posts: 2, Reputation: 1
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    #1

    Jun 2, 2013, 08:03 AM
    Verifying trigonometry identities
    Sin^2 x - cos^2 x = 2 sin^2 x - 2
    Gagereesman's Avatar
    Gagereesman Posts: 2, Reputation: 1
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    #2

    Jun 2, 2013, 08:05 AM
    Verifying trigonometry identities
    Sin^2 x - cos^2 x = 2 sin^2 x - 1
    Curlyben's Avatar
    Curlyben Posts: 18,514, Reputation: 1860
    BossMan
    		  
    #3

    Jun 2, 2013, 08:34 AM
    What do YOU think ?
    While we're happy to HELP we won't do all the work for you.
    Show us what you have done and where you are having problems..
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Jun 4, 2013, 07:37 AM
    You need to memorize and use the basic identity sin^2x + cos^2x = 1, and its alternative forms sin^2x = 1-cos^2x and cos^2x = 1 - sin^2x.
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