SOLUTION: 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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Question 628469: Use a graphing calculator to solve the equation -3 cos t = 1 in the interval from 0 to 2p. Round to the nearest hundredth.
Found 2 solutions by stanbon, Edwin McCravy:
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
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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cos(t) = -1/3
Take the cos^-1 of both sides to get:
t = cos^-1(-1/3) = 109.47 degrees or 250.53 degrees
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Cheers,
Stan H.
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Answer by Edwin McCravy(20060) (Show Source):
You can put this solution on YOUR website!
Use a graphing calculator to solve the equation -3 cos t = 1 in the interval from 0 to 2p. Round to the nearest hundredth.

On your TI-83 or TI-84, press ON press MODE Make sure RADIAN is highlighted press Y= (clear anything in there after any \Y= Make it read this: \Y1=-3cos(3x) \Y2=1 press ZOOM press 7 That's the graph for -2pi to 2pi You only want graph for 0 to 2pi press WINDOW you see Xmin=-6.152286... change it to read Xmax=0 press GRAPH see something like this without the numbers: press 2nd press TRACE press 5 Press ENTER three times at bottom of screen read first answer X=1.9106332 For second answer press 2nd press TRACE press 5 press ENTER two times press the right arrow key about 35 to 40 times to get the cursor over near the second intersection point. press ENTER at bottom of screen read second answer X=4.3725521 Edwin