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Maths

Cos2x cosx/2 -cos3x cos9x/2 =sin7x/2 sin4x

Prove it

Harsh Sharma

Sept. 26, 2017, 10:50 a.m.

Answers!

Davneet Singh

Sept. 26, 2017, 10:50 a.m.

Hello Harsh

Please check 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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