Images COS X1

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Cos x1. 1+Cosx+cos2x=0. 2cos^2x-cosx-1=0. Cosx/2+cosx=0. Cosx=-1/2.
1+Cosx+cos2x=0. 2cos^2x-cosx-1=0. Cosx/2+cosx=0. Cosx=-1/2.

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