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    wallsa17's Avatar
    wallsa17 Posts: 2, Reputation: 1
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    #1

    Dec 1, 2010, 05:58 AM
    Verify the identity: cos x sin x tan x = sec x.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 1, 2010, 07:00 AM

    It ain't so. Note that for x =0, you get



    So the identity is incorrect.
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    cgamboa2412 Posts: 1, Reputation: 1
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    #3

    Dec 14, 2011, 09:18 AM
    verify cosx + sinx tanx=secx
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    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Dec 14, 2011, 09:40 AM
    Quote Originally Posted by cgamboa2412 View Post
    verify cosx + sinx tanx=secx
    In the furture please do not tag a new question onto an old post. Start a new thread instead.

    This identity can be proved by replacing the tan(x) function with sin(x)/cos(x) and then combining the left hand side into a single fraction. Finally recall that cos^2x + sin^2x = 1.
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