Edward C. answered • 02/01/20
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Caltech Grad for math tutoring: Algebra through Calculus
Try using the half angle formula for tangent.
tan(x/2) = sin(x) / [ 1 + cos(x) ]
Judite S.
asked • 02/01/20If cos x=−4/5, and 180°<x<270° is in Quadrant III, what is tan(x/2)?
Help me please...........
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