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OpenStudy (anonymous):
What is the value of the expression? cos-1 (√2)/2
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OpenStudy (solomonzelman):
Hint:|dw:1406233592685:dw|
OpenStudy (solomonzelman):
\(\large\color{blue}{ \cos^{-1} \frac{\sqrt{2} } {2}= \text{__}° }\)
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