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24,cos4x-cos4 alpha=8(cos x-cos a)(cos x...

24,cos4x-cos4 alpha=8(cos x-cos a)(cos x+cos a)(cos x-sin alpha)(cos x+sin alpha)

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cos4x-cos4 alpha = 8 (cos x-cos alpha) (cos x + cos alpha) (cos x-sin alpha) (cos x + sin alpha

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(cos2x-cos2 alpha)/(cos x-cos alpha)

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