cos A = -4/5
A = cos^-1 (-4/5)
A = 143°
tan (143/2) = 2.98
If cos A = -4/5 for angle A in Quadrant II, find tan A/2?
cos A = -4/5
A = cos^-1 (-4/5)
A = 143°
tan (143/2) = 2.98
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