Show that cos 2x cos x/2 – cos 3x cos 9x/2 = sin 5x sin 5x/2 #iitjee #maths
Math: Proof that cos2x = 2cos^2x -1
Prove that `cos 2xcosx/2-cos 3x cos(9x/2)= sin5x sin(5x)/2` ....
cos 2x = 2 cos^2 x - 1
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prove that Cos2x cos(x/2)−cos3xcos(9x/2)=sin5xsin(5x/2) ||
cos 2x cos x/2 - cos 3x cos 9x/2 = sin5x sin 5x/2 | Example 26 class 11 NCERT @StudyPointPro
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