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OpenStudy (anonymous):
trig help PLEASE!! If cos A = -4/5 for angle A in Quadrant II, find cos A/2.
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OpenStudy (anonymous):
if you look the inverse of cos(-4/5 )you get A= 143.13 deg. A/2=143.13/2= 71.56deg. cos 71.56 =approx.3/10
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