anonymous
  • anonymous
Find the exact value of arccos -(sqrt(3)/(2)) without using a calculator.
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
look at cheat sheet here http://tutorial.math.lamar.edu/cheat_table.aspx
anonymous
  • anonymous
find the angle (number) whose cosine is \[-\frac{\sqrt{3}}{2}\] in other words look at the unit circle on the bottom and find the angle where that is the first coordinate
anonymous
  • anonymous
make sure you are looking at the upper half of the circle between 0 and pi or between 0 and 180 if you are working in degrees

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anonymous
  • anonymous
so I got 5pi/3 but does the arc part mean anything???
anonymous
  • anonymous
arc just means ur going in reverse to figure out x in cos(x) = given value. The trig value u have is a special angle.

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