Last updated at May 29, 2018 by Teachoo

Transcript

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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Chapter 3 Class 11 Trigonometric Functions

Serial order wise

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.