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CBSE Class 11 Maths Trigonometric Functions Formulas · 1. sin A = opposite/hypotenuse = a/c · 2. cos A = adjacent/hypotenuse = b/c · 3. tan A = opposite/adjacent = This contains a list all the Trigonometry Formulas for class 11 . Formula includes Basic Formula,half angle ,sum and differences, double angle, Sep 10, 2020 - This contains a list all the Trigonometry Formulas for class 11 . Formula includes Basic Formula,half angle ,sum and differences, The important trigonometry formulas Class 11 are as below: sin (x + y) = sin x cos y + cos x sin y; sin (x - y) = sin x cos y – cos x sin y; cos (x + y) = cos xVidyakul provides FREE PDF Download for CBSE Class 11 Math Chapter 3 Trigonometric Functions Formulae prepared by expert math teachers according to the Download the below PDF to get the formulas of class 11 trigonometry. All the formulas of trigonometry chapter are provided here for students to help Trigonometric Ratios of Allied Angles​​ Two angles are said to be allied when their sum or difference is either zero or a multiple of 90°. The angles — θ, 90° ±