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Ex 3.3, 16 - Prove that cos 9x - cos 5x / sin 17x - sin 3x - Ex 3.3

Ex 3.3, 16 - Chapter 3 Class 11 Trigonometric Functions - Part 2

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Ex 3.3, 16 Prove that 9 5 /( 17 3 ) = 2 / 10 Taking L.H.S 9 5 /( 17 3 ) We solve cos 9x cos 5x & sin 17x sin 3x seperately Now, 9 5 /( 17 3 ) = ( 2 sin (7x) sin (2x) )/(2 (10x)sin (7x) ) = sin (2x) / (10x) = R.H.S So, L.H.S. = R.H.S. Hence proved

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