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cos2x 2
cos2x 2cosx
cos2x 2cos 2x-1
cos2x 2sinxcosx
cos2x 2sin2x-1
cos2x 2+sin2x 2
cos2x 2cos 2x
cos2x 2cosx-1
cos2x 2cosx+1 0
cos2x 1-2sin 2x
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