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Math Help - Radicals in trigonometric ratios

  1. #1
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    Radicals in trigonometric ratios

    I was wondering how would i find x degree if 3√ 5 is the hypotenuse and 3 is the adjacent side I would have to use cos-1. The 3√ 5 is what i don't understand the most how would i put that into a TI calculator? Thanks for your help.
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  2. #2
    Moo
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    Hello,

    There's a square root sign in a TI. In my TI89, it's above the multiplication sign ( \boxed{\text{2nd}} ~ \times)

    Is it what you were looking for ?
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  3. #3
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    Not really, I was looking for how to find out how to solve x degrees with using cosine. my calculator won't let me put cos-1(3/3√ 5).
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  4. #4
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    Quote Originally Posted by Jubbly View Post
    Not really, I was looking for how to find out how to solve x degrees with using cosine. my calculator won't let me put cos-1(3/3√ 5).
    you have to put the entire denominator in parentheses ...

    \cos^{-1}(3/(3\sqrt(5)))

    or, you can try simplifying first ...

    \frac{3}{3\sqrt{5}} = \frac{1}{\sqrt{5}}

    now try it
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  5. #5
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    And press the green diamond + enter to get an approximate value. (I only know what command to do with a TI89, not with a 80,82,83 or 84)
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