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Trigonometry 11 Online
OpenStudy (anonymous):

Find sin x/2, cos x/2, and tan x/2 from the given information. cosx= -4/5, 180° < x < 270°

OpenStudy (anonymous):

sin x/2=sin 12.92≈0.2236..(in quadrant II where sin>0) √.05=0.2236..

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