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cos2xcosx/2-cos3xcos(9x)/2=sin5xsin(5x)/...

`cos2xcosx/2-cos3xcos(9x)/2=sin5xsin(5x)/2`

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Prove that: cos2x cos(x/2)-cos3x cos((9x)/2)=sin5x sin((5x)/2)

Prove that cos 2xcos(x/2)-cos 3x cos((9x)/2)= sin5x sin((5x)/2) .

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cos x cos((x)/(2))-cos3x cos((9x)/(2))=sin7x sin8x

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