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gjhfdfg Group Title

Use a graphing calculator to solve the equation -3 cos t = 1 in the interval from 0 to 2p. Round to the nearest hundredth.

  • one year ago
  • one year ago

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  1. gjhfdfg Group Title
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    I typed it in on my calculator but did not do a thingg!

    • one year ago
  2. swissgirl Group Title
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    \(\cos(t)=\large{1 \over- 3} \) \(\cos^{-1}(\large{1 \over- 3} )=t\)

    • one year ago
  3. gjhfdfg Group Title
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    How did you get that?

    • one year ago
  4. swissgirl Group Title
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    First I divided -3 from both sides

    • one year ago
  5. swissgirl Group Title
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    \(-3\cos(t)=1\) \(\large {-3\cos(t) \over -3}={1 \over -3}\) \(\cos(t)=\large{1 \over -3}\) \(\cos^{-1}(\cos(t))=Cos^{-1}(\large{1 \over -3})\) \(t=Cos^{-1}(\large{1 \over -3})\)

    • one year ago
  6. gjhfdfg Group Title
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    How would you put this in a decimal form.?

    • one year ago
  7. swissgirl Group Title
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    lol you gotta put this into your calc first and then your answer will be a decimal

    • one year ago
  8. gjhfdfg Group Title
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    Oh wow that was dumb of me lol. I was thinking this had to be put in a decimal form.! before solving it

    • one year ago
  9. gjhfdfg Group Title
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    I got 109.47

    • one year ago
  10. swissgirl Group Title
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    Are you supossed to be working in radians or degrees?

    • one year ago
  11. gjhfdfg Group Title
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    Ah, I had my calc set in degrees, I'm pretty sure I'm suppose to be using radians.! Gah I keep forgetting to change the mode

    • one year ago
  12. gjhfdfg Group Title
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    Ok now I got 1.91.!

    • one year ago
  13. swissgirl Group Title
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    YUP THAT IS WHAT I GOT :)

    • one year ago
  14. gjhfdfg Group Title
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    Thanks for the help.! (-:

    • one year ago
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