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Answer to Question #53984 in Trigonometry for Cameron
Question #53984
if t = tan(x/2), -π<x<π, sketch aright triangle or use trigonometric identities to show that
cos(x/2) = 1/sqrt(1+t^2) and sin(x/2) = t/sqrt(1+t^2)
cos(x/2) = 1/sqrt(1+t^2) and sin(x/2) = t/sqrt(1+t^2)
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