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gjhfdfg

  • 3 years ago

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

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  1. gjhfdfg
    • 3 years ago
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    I typed it in on my calculator but did not do a thingg!

  2. swissgirl
    • 3 years ago
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    \(\cos(t)=\large{1 \over- 3} \) \(\cos^{-1}(\large{1 \over- 3} )=t\)

  3. gjhfdfg
    • 3 years ago
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    How did you get that?

  4. swissgirl
    • 3 years ago
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    First I divided -3 from both sides

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

  6. gjhfdfg
    • 3 years ago
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    How would you put this in a decimal form.?

  7. swissgirl
    • 3 years ago
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    lol you gotta put this into your calc first and then your answer will be a decimal

  8. gjhfdfg
    • 3 years ago
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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

  9. gjhfdfg
    • 3 years ago
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    I got 109.47

  10. swissgirl
    • 3 years ago
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    Are you supossed to be working in radians or degrees?

  11. gjhfdfg
    • 3 years ago
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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

  12. gjhfdfg
    • 3 years ago
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    Ok now I got 1.91.!

  13. swissgirl
    • 3 years ago
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    YUP THAT IS WHAT I GOT :)

  14. gjhfdfg
    • 3 years ago
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    Thanks for the help.! (-:

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