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Continue to ChatEx 3.3, 24 - Chapter 3 Class 11 Trigonometric Functions https://teachoo.com//2196/1409/Ex-3.3--24---Prove-cos-4x--1---8-sin2-x-cos-2-x---Chapter-3/category/2x-3x-formula---Proving/
Ex 3.3, 24 - Chapter 3 Class 11 Trigonometric Functions https://teachoo.com//2196/1409/Ex-3.3--24---Prove-cos-4x--1---8-sin2-x-cos-2-x---Chapter-3/category/2x-3x-formula---Proving/