Ex 3.3, 17 - Prove sin 5x + sin 3x / cos 5x + cos 3x = tan 4x - cos x + cos y formula

  1. Chapter 3 Class 11 Trigonometric Functions
  2. Serial order wise
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Ex3.3, 17 Prove that 5 + 3 / 5 + 3 = tan 4x Taking L.H.S. 5 + 3 / 5 + 3 We solve sin 5x + sin 3x & cos 5x + cos 3x seperately Now 5 + 3 / 5 + 3 = (2 4x )/(2 4 ) = 4x /cos 4x = tan 4x = R.H.S Hence L.H.S = R.H.S Hence proved

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