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\:cos\:^{-1\:}\left(0.25\right)=\:0^{\circ }\:to\:360^{\circ }\:

 Dec 19, 2016
 #1
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cos^-1(.25) =75.52degrees   Cosine is POSITIVE in QUADRANTS  I and IV, so 360-75.52=284.48 degrees is the other answer

 Dec 19, 2016

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