Example 16 - Prove cos 7x + cos 5x / sin 7x - sin 5x = cot x - cos x + cos y formula

  1. Chapter 3 Class 11 Trigonometric Functions
  2. Serial order wise
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Example 16 Prove that 7 + 5 / 7 5 = cot x Taking L.H.S. 7 + 5 / 7 5 We solve cos 7x + cos 5x & sin 7x sin 5x seperately Now 7 + 5 / 7 5 = (2 6x )/(2 6 si ) = x /sin x = cot x = R.H.S. Hence L.H.S. = R.H.S. Hence proved

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