Show that cos 2x cos x/2 – cos 3x cos 9x/2 = sin 5x sin 5x/2 #iitjee #maths

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

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prove that Cos2x cos(x/2)−cos3xcos(9x/2)=sin5xsin(5x/2) ||

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cos 2x cos x/2 - cos 3x cos 9x/2 = sin5x sin 5x/2 | Example 26 class 11 NCERT @StudyPointPro

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