1- cos(B) + cos(2B)=cos^2(B)+sin^2(B)-cosB+cos^2(B)-sin^2(B)=
=2cos^2(B)-cosB =cos(B)*(2cos(B)-1)
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1- cos(B) + cos(2B)=cos^2(B)+sin^2(B)-cosB+cos^2(B)-sin^2(B)=
=2cos^2(B)-cosB =cos(B)*(2cos(B)-1)