cos2x into cos x by 2 minus Cos 3 X into cos 9 x by 2 is equal to sin 5 x into sin 5 x by 2

Shivendra Singh's image
Shivendra Singh
March 25, 2017, 12:43 a.m.

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Davneet Singh
March 25, 2017, 12:42 p.m.

Hi Shivendra,

Please check Example 26 of Chapter 3 Class 11 here https://www.teachoo.com/2230/586/Example-26---Prove-cos-2x-cos-x-2---cos-3x-cos-9x-2-=-sin-5x/category/Examples/

 

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