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marcoduuuh

Fill in the blank Cos _____ equals √3/2 A. 75 B. 30 C. 45 D. 60

  • one year ago
  • one year ago

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  1. tomo
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    find inverse cos (sqrt(3)/2)

    • one year ago
  2. marcoduuuh
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    How do I do that?

    • one year ago
  3. tomo
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    ok, one moment. I'm close.

    • one year ago
  4. tomo
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    ok, imagine you have a 30 60 90 triangle |dw:1358813789639:dw| cos(30) = sqrt(3)/2 inverse cos (30) = 1/cos(30) 1/cos(30) = 1/(sqrt(3)/2)) 1/cos(30) = 2/(sqrt(3))

    • one year ago
  5. marcoduuuh
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    • one year ago
  6. tomo
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    actually i messed up a bit on the last part

    • one year ago
  7. RyanL.
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    \[\cos x=\frac{\sqrt{3}}{2}\]\[x=\cos^{-1}\frac{\sqrt{3}}{2}\]

    • one year ago
  8. RyanL.
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    plug that into a calculator and see what you get

    • one year ago
  9. tomo
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    cos(30) = 2/sqrt(3) inverse cos (30) = 1/cos(30) 1/cos(30) = 1/(2/sqrt(3)) 1/cos(30) = (sqrt(3)/2))

    • one year ago
  10. tomo
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    you do not need a calculator to solve this.

    • one year ago
  11. marcoduuuh
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    x=60?

    • one year ago
  12. tomo
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    actually x= 30. cos(30) = 2/(sqrt(3)) and cos^-1(30) = sqrt(3)/2

    • one year ago
  13. marcoduuuh
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    Thank you!

    • one year ago
  14. tomo
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    yw

    • one year ago
  15. tashastevens1
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    i believe it's 30 ...just plug into calculator. ;D

    • one year ago
  16. marcoduuuh
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    Did it, it's 30. Thank you. (:

    • one year ago
  17. tashastevens1
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    im sooo un-usefull on here ...-__- i tried haha at least it was the right answer this time ...

    • one year ago
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