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    marieridge's Avatar
    marieridge Posts: 1, Reputation: 1
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    #1

    Dec 9, 2011, 03:35 PM
    Verify the identity: cos x sin x tan x = sec x.
    Verify the identity: cos x sin x tan x = sec x.
    corrigan's Avatar
    corrigan Posts: 115, Reputation: 18
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    #2

    Dec 10, 2011, 11:10 PM
    this isn't true. For a counter example, let x = pi/4.
    So sin x cos x tan x = 1/2, but sec x = sqrt of 2.
    Kahani Punjab's Avatar
    Kahani Punjab Posts: 510, Reputation: 203
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    #3

    Dec 11, 2011, 12:35 AM
    Marie Ridge,

    If cos x. sin x. tan x = sec x
    cos x.sin x . Sin x/cos x = sec x
    sin x. sin x = sec x
    sin ~2 x = sec x

    Try further, and if it does not help, write here. I am ready to help you, but you must show what you have calculated so far, and from what I suggest, what did you find, now?
    Aurora2000's Avatar
    Aurora2000 Posts: 111, Reputation: 16
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    #4

    Dec 11, 2011, 08:32 AM
    The display is not correct, sometimes the plus sign misses unless the "math" environment is used.

    The correct assertion is



    which is easily solved by multiplying both sides by and using , .
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