Ex 3.2, 10 - Chapter 3 Class 11 Trigonometric Functions

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Ex 3.2, 10 Find the value of the trigonometric function cot ("–" 15"π" /4) cot ((−15 𝜋)/4) = –cot ((15 𝜋)/4) = –cot ("3" 𝟑/𝟒 "π" ) = –cot ("4π – " 𝟏/𝟒 " π" ) = – cot ((−𝟏)/𝟒 " π" ) Values of cot x repeats after an interval of 2π. Hence, ignoring 4π i.e. 2 × (2π) Rough So, 15/4 = 3 3/4 = 3 + 3/4 or 4 – 1/4 We take 4 – 𝟏/𝟒 as it is even

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo