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marcoduuuh

  • 3 years ago

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

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

  2. marcoduuuh
    • 3 years ago
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    How do I do that?

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

  4. tomo
    • 3 years ago
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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))

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

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

  8. RyanL.
    • 3 years ago
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    plug that into a calculator and see what you get

  9. tomo
    • 3 years ago
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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))

  10. tomo
    • 3 years ago
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    you do not need a calculator to solve this.

  11. marcoduuuh
    • 3 years ago
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    x=60?

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

  13. marcoduuuh
    • 3 years ago
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    Thank you!

  14. tomo
    • 3 years ago
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    yw

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

  16. marcoduuuh
    • 3 years ago
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    Did it, it's 30. Thank you. (:

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

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