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    Cmegehee91's Avatar
    Cmegehee91 Posts: 4, Reputation: 2
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    #1

    Mar 3, 2013, 12:14 PM
    Proving a rather difficult trigonometric identity
    Can anyone prove, and show step by step, that

    1 + cosx + sinx = secx + tanx
    1 + cosx - sinx

    Because I am absolutely stumped.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Mar 4, 2013, 09:25 AM
    Same advice as with your other recent post - convert the secant and tangent functions to their sine and cosibne equivalents, and simplfy. The only trick you will have to use is to recognize that 1-sin^2x = cos^2x.
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