Ex 3.2, 10 - Chapter 3 Class 11 Trigonometric Functions
Last updated at August 17, 2026 by Teachoo
Finding Value of trignometric functions, given angle
Negative Angle Identities
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Chapter 3 Class 11 Trigonometric Functions
Concept wise
- Radian measure - Conversion
- Arc length
- Finding Value of trignometric functions, given other functions
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Finding Value of trignometric functions, given angle
- (x + y) formula
- 2x 3x formula - Proving
- 2x 3x formula - Finding value
- cos x + cos y formula
- 2 sin x sin y formula
- Finding Principal solutions
- Finding General Solutions
- Sine and Cosine Formula
Transcript
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
