Cos x + cos y formula
Ex 3.3, 11 Important
Misc 3
Misc 4 Important
Ex 3.3, 14
Ex 3.3, 15
Misc 5
Misc 7 Important
Example 16 Important
Ex 3.3, 16 Important
Ex 3.3, 17
Ex 3.3, 18 Important
Ex 3.3, 19 You are here
Ex 3.3, 20
Ex 3.3, 21 Important
Example 17 Important
Misc 6 Important
cos x + cos y formula
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Ex3.3, 19 Prove that sin x + sin 3x /( x + 3x ) = tan 2x Taking L.H.S. sin x + sin 3x /( x + 3x ) We solve sin x + sin 3x & cos x + cos 3x seperately Now + 3 / + 3 = (2 2x ( ) )/(2 2 ( ) ) = 2x /cos 2x = tan 2x = R.H.S Hence L.H.S = R.H.S Hence proved
