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anonymous

  • one year ago

find the missing value. cos__=2/5 how to do this

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  1. anonymous
    • one year ago
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    Don't you use the unit circle?

  2. anonymous
    • one year ago
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    no idea xD

  3. ganeshie8
    • one year ago
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    you need to use calculator

  4. ganeshie8
    • one year ago
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    \(\cos\_\_ = 2/5 \) \(\_\_= \cos^{-1}(2/5)\)

  5. UsukiDoll
    • one year ago
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    ti-83 calculator xD I think any calculator can do it

  6. ganeshie8
    • one year ago
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    wolfram can do it too http://www.wolframalpha.com/input/?i=cos%5E%28-1%29%282%2F5%29

  7. UsukiDoll
    • one year ago
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    I got 66.42 off of my windows calculator in degree mode

  8. UsukiDoll
    • one year ago
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    yay I got it ! :D

  9. ganeshie8
    • one year ago
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    i think solving analytically is hard we can approximate using newton or some other numerical stuff

  10. anonymous
    • one year ago
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    thank you i got it

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spraguer (Moderator)
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