Ex 3.2, 9 - 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 3.2,9 Find the value of the trigonometric function sin (β11"Ο" /3) sin ((βππ π )/π) = βsin ((11 π)/3) = βsin ("3 " π/π " Ο" ) = βsin ("4Ο β " π/π " Ο" ) = βsin ((βπ)/π " Ο" ) Rough So, 11/3 = 3 2/3 = 3 + 2/3 or 4 β 1/3 We take 4 β π/π as it is even = β ("βsin " (1/3 " Ο" )) = sin (π/π " Ο" ) = sin 60Β° = βπ/π
