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OpenStudy (anonymous):
if cos 65 degree +cos 55 degree = cos θ,find θ in radians
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OpenStudy (turingtest):
cos 65 degrees=0.4226 cos 55 degrees=0.5735 + ------------------------ cos(theta)=0.99617 take the inverse cosine: theta=arccos(0.9961)=5.011 degrees convert degrees to radians 5.011(pi/180)=0.875 radians
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