SOLUTION: What is the value of cos−1 ⁡(−√2/2) in Quadrant II? cos−1⁡ (−√2/2)= __________°

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Question 1062978: What is the value of cos−1 ⁡(−√2/2) in Quadrant II?
cos−1⁡ (−√2/2)= __________°

Found 3 solutions by Alan3354, josmiceli, MathTherapy:
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
You could find the answer with a calculator.
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I recommend you learn the unit circle, tho.
Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!
in quadrant 2
( I like to write it this way )
This is the same as:

Since


The terminal point is ( -1,1 )
This gives me an angle of


Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!
What is the value of cos−1 ⁡(−√2/2) in Quadrant II?
cos−1⁡ (−√2/2)= __________°
In the 1st quadrant: 

In the 2nd quadrant, where cos < 0, the reference angle of 

Converting  to, radians, we get:  

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