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  1. Chapter 3 Class 11 Trigonometric Functions
  2. Serial order wise

Transcript

Ex 3.2, 10 Find the value of the trigonometric function cot ("โ€“" 15"ฯ€" /4) cot ((โˆ’15 ๐œ‹)/4) = โ€“cot ((15 ๐œ‹)/4) = โ€“cot ("3" 3/4 "ฯ€" ) = โ€“cot ("4ฯ€ โ€“ " 1/4 " ฯ€" ) = โ€“ cot ((โˆ’1)/4 " ฯ€" ) Values of cot x repeats after an interval of 2ฯ€ , Hence ignoring 4ฯ€ i.e. 2 ร— (2ฯ€) Rough So, 15/4 = 3 3/4 = 3 + 3/4 or 4 โ€“ 1/4 We take 4 โ€“ 1/4 as it is even = โ€“("โ€“ cot " (1/4 " ฯ€" )) = cot (1/4 " ฯ€" ) = cot (1/4 " ร— 180" ) = cot 45ยฐ = 1

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.