Lois V.

asked • 03/13/16

I am trying to use the half-angle formulas, but I'm just stuck.

Use the half-angle formulas to determine the exact values of the sine, cosine, and tangent of the angle.
7π/12

5 sin(7π/12) =


9 cos(7π/12) =

5 tan(7π/12) =

1 Expert Answer

By:

Mark M.

For 7π/12, in QII, sine is positive, cosine in negative, tangent is negative. Therefore the results are not ±.
Report

03/13/16

Arthur D.

tutor
Thank you, Mark. I'll make my corrections. Feel free to correct me again if I make a mistake correcting these.
Arthur D.
Report

03/14/16

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