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sin(n+1) A *sin(n+2)A +cos (n+1) A *cos(...

`sin(n+1) A *sin(n+2)A +cos (n+1) A *cos(n+2)A = cos A `

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sin (n +1) x sin (n +2) x + cos (n +1) x cos (n +2) x = cos x

sin (n +1) x sin (n +2) x + cos (n +1) x cos (n +2) x = cos x

sin (n +1) x sin (n +2) x + cos (n +1) x cos (n +2) x = cos x

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