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

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Show that cos 2x cos x/2 – cos 3x cos 9x/2 = sin 5x sin 5x/2 #iitjee #maths
  1. BKMathur Maths Delhi
  2. Show that cos 2x cos x/2 – cos 3x cos 9x/2 = sin 5x sin 5x/2
  3. cos 2x cos x/2 – cos 3x cos 9x/2 = sin 5x sin 5x/2
  4. BKMathur maths Delhi
  5. BKMathur sir
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