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

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

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sin (n + 1) A sin (n-1) A + cos (n + 1) A cos (n-1) A = cos2A

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