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Math Help - help with inverse trigonometric functions

  1. #1
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    help with inverse trigonometric functions

    I am stuck on these 2 problems and was wondering if someone could work them out for me?

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  2. #2
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    what have you tried ?
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  4. #4
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    this is a brilliant tool thank you very much! But i do have one problem. For this problem sin(arccos 2/5 - arctan5) - Wolfram|Alpha I need exact form and it gives it ot me in decimal. What can I do?
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  5. #5
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    Quote Originally Posted by wonderd View Post
    this is a brilliant tool thank you very much! But i do have one problem. For this problem sin(arccos 2/5 - arctan5) - Wolfram|Alpha I need exact form and it gives it ot me in decimal. What can I do?
    work it out by hand using the difference identity for sine and some right triangle trig.
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  6. #6
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    would someone be willing to work it out for me?
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  7. #7
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    What does \displaystyle \tan{45^{\circ}} equal? What is the inverse cosine of that?
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