Brian K.

asked • 04/13/18

Find cos theta/2 given that cos theta = -1/2

Please help

Mark M.

Look up the "Half-Angle Formulas!"
Report

04/13/18

Paul M.

tutor
Or perhaps remember that the 1/2 angle formula comes from the formula
cos2x - sin2 x = cos 2x
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04/13/18

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