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-   -   Verify the identity: cos x sin x tan x = sec x. (https://www.askmehelpdesk.com/showthread.php?t=618326)

  • Dec 9, 2011, 03:35 PM
    marieridge
    Verify the identity: cos x sin x tan x = sec x.
    Verify the identity: cos x sin x tan x = sec x.
  • Dec 10, 2011, 11:10 PM
    corrigan
    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.
  • Dec 11, 2011, 12:35 AM
    Kahani Punjab
    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?
  • Dec 11, 2011, 08:32 AM
    Aurora2000
    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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