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Some Sine and Cosine Identities Obtained from Pascal's Triangle

... which cos 2x cos kx = cos (k+2)x +cos (k-2)x 2 cos 2x sinkx = sin (k+2)x + sin (k-2)x 2 cos2x = 2/4 + (cos 2x)/2 sin2x = 2/4 - (cos 2x)/2 ...

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