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anonymous

  • 5 years ago

Find the exact value of arccos -(sqrt(3)/(2)) without using a calculator.

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  1. anonymous
    • 5 years ago
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    look at cheat sheet here http://tutorial.math.lamar.edu/cheat_table.aspx

  2. anonymous
    • 5 years ago
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    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

  3. anonymous
    • 5 years ago
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    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

  4. anonymous
    • 5 years ago
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    so I got 5pi/3 but does the arc part mean anything???

  5. anonymous
    • 5 years ago
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    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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