anonymous
  • anonymous
Use a graphing calculator to solve the equation -3 cos t = 1 in the interval from 0 to 2p. Round to the nearest hundredth.
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
I typed it in on my calculator but did not do a thingg!
swissgirl
  • swissgirl
\(\cos(t)=\large{1 \over- 3} \) \(\cos^{-1}(\large{1 \over- 3} )=t\)
anonymous
  • anonymous
How did you get that?

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swissgirl
  • swissgirl
First I divided -3 from both sides
swissgirl
  • swissgirl
\(-3\cos(t)=1\) \(\large {-3\cos(t) \over -3}={1 \over -3}\) \(\cos(t)=\large{1 \over -3}\) \(\cos^{-1}(\cos(t))=Cos^{-1}(\large{1 \over -3})\) \(t=Cos^{-1}(\large{1 \over -3})\)
anonymous
  • anonymous
How would you put this in a decimal form.?
swissgirl
  • swissgirl
lol you gotta put this into your calc first and then your answer will be a decimal
anonymous
  • anonymous
Oh wow that was dumb of me lol. I was thinking this had to be put in a decimal form.! before solving it
anonymous
  • anonymous
I got 109.47
swissgirl
  • swissgirl
Are you supossed to be working in radians or degrees?
anonymous
  • anonymous
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
anonymous
  • anonymous
Ok now I got 1.91.!
swissgirl
  • swissgirl
YUP THAT IS WHAT I GOT :)
anonymous
  • anonymous
Thanks for the help.! (-:

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