the principal value of Cos inverse minus 1 by 2 is
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2π/3 is the principal value
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Cos = - 1/2
inverse = 1/2
then,cos 60° =1/2
so,principle value of cos inverse minus 1 by 2 is cos60°
inverse = 1/2
then,cos 60° =1/2
so,principle value of cos inverse minus 1 by 2 is cos60°
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