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Ans Cos 135° can be written as Cos (90° 45°) Using formula, Cos (ab) = Cos a Cos b – Sin a Sin b So, Cos 135° = Cos 90° Cos 45° – Sin 90° Sin 45° cos 135° = 0 x 1/√2 – 1 x 1/√2Trigonometry angles are the angles derived from the ratios of trigonometry functions Trigonometry is the study of the relationship between angle and sides of a rightangle triangle30° 1 √3 = √3 3 45° 1 60° √3 What is an exact value? Ex 3 2 9 Find Value Of Sin 11pi 3 Chapter 3 Class 11 Teachoo Sin √3/2 value in degrees