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Math Help - Trig problem

  1. #1
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    Trig problem

    I have to express the given trigonometric function in terms of the indicated function.

    cos theata in terms of sec theata.

    I have no clue, please help.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by scottsw1 View Post
    I have to express the given trigonometric function in terms of the indicated function.

    cos theata in terms of sec theata.

    I have no clue, please help.
    by definition: \sec \theta = \frac 1{\cos \theta}

    just solve that for \cos \theta (make it the subject of the formula)
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  3. #3
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    All i know is sec is the inverse of cos. see, if it works for you and help you solve your problem.
    Last edited by Jhevon; April 18th 2009 at 08:20 PM. Reason: removed chat speak
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by lekhabhatt81 View Post
    All i know is sec is the inverse of cos. see, if it works for you and help you solve your problem.
    it is better to say "reciprocal" than "inverse" here. the inverse of \cos x is \cos^{-1} x (or \arccos x), and this is different from \sec x
    Last edited by Jhevon; April 18th 2009 at 08:21 PM.
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  5. #5
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    You are indeed correct. Sec is the reciprocal of cos. thanks buddy!
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  6. #6
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    I am lost, please help. I know that sec=1 over cos, but what forumlua do I use to work the problem?
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  7. #7
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    could you put in the entire question? because with what you have put up... this is all that can be said, i guess.
    Last edited by Jhevon; April 19th 2009 at 08:11 PM. Reason: removed chat speak
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  8. #8
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    Express the given trigometric function in terms of the indicated fucntion:
    cos theta in terms of sec theata.
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  9. #9
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by scottsw1 View Post
    Express the given trigometric function in terms of the indicated fucntion:
    cos theta in terms of sec theata.
    you already have the formula. i told you the formula. just solve for cosine
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  10. #10
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    Please show me how to work the entire problem out. Thanks.
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  11. #11
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    Quote Originally Posted by scottsw1 View Post
    Please show me how to work the entire problem out. Thanks.
    Jhevon has solved the problem for you as best it can be solved with the information you have given. Are there any further values you have not supplied?
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  12. #12
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    Here is a photocopy of the problem:
    http://farm4.static.flickr.com/3619/...c5c8a712db.jpg
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  13. #13
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    Does the link show an insight on how to solve the problem?
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  14. #14
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    I looked at the link.

    Some of the problems are written very strangly. For example in ther first problem the first sec part of the equation seems to be raised to the power of something. But what?
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