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OpenStudy (anonymous):
What is arccos(− 2√/ 2 ) in degrees?
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OpenStudy (igreen):
Can't you just plug this into your calculator?
OpenStudy (kanwal32):
is it -2/sqrt2
OpenStudy (anonymous):
|dw:1455127110994:dw| So now you just need to decide Quadrants. I find knowing (memorizing) the unit circle helpful.
OpenStudy (anonymous):
Oh, and pi/4 radians = 45 deg.
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