sin .5x = ((1 - cos x)/2)^.5
sin .5(30) = ((1 - cos 30)/2)^.5 =((1 - √3/2)/2)^.5 = ((1 - .8660)/2)^.5 = √.0670 = 0.2588
Billy B.
asked • 07/06/15cannot figure out
USE THE HALF-ANGLE IDENTITIES TO EVALUATE EXACTLY?
SIN 15°=
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