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    Broncogirl8 Posts: 1, Reputation: 1
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    #1

    Apr 22, 2012, 10:46 AM
    Trigonometric identity
    Sec(x) - tan(x) sin(x) = cos(x)
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Apr 23, 2012, 08:14 AM
    Hint: convert the sec(x) and tan(x) functions to their sine and cosine equivalents. And remember that 1-sin^2x = cos^2x.
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