anonymous
  • anonymous
find the missing value. cos__=2/5 how to do this
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Don't you use the unit circle?
anonymous
  • anonymous
no idea xD
ganeshie8
  • ganeshie8
you need to use calculator

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ganeshie8
  • ganeshie8
\(\cos\_\_ = 2/5 \) \(\_\_= \cos^{-1}(2/5)\)
UsukiDoll
  • UsukiDoll
ti-83 calculator xD I think any calculator can do it
ganeshie8
  • ganeshie8
wolfram can do it too http://www.wolframalpha.com/input/?i=cos%5E%28-1%29%282%2F5%29
UsukiDoll
  • UsukiDoll
I got 66.42 off of my windows calculator in degree mode
UsukiDoll
  • UsukiDoll
yay I got it ! :D
ganeshie8
  • ganeshie8
i think solving analytically is hard we can approximate using newton or some other numerical stuff
anonymous
  • anonymous
thank you i got it

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