Images COS X

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Cos x. Cos2x=2cos^2x-1. Cos^2x=1/2. 2cos x/2 1+cos x. 1+Cos2x/1-cos2x.
Cos2x=2cos^2x-1. Cos^2x=1/2. 2cos x/2 1+cos x. 1+Cos2x/1-cos2x.

See also