When we add or subtract angles, the result is called a compound angle.

**Trigonometric ratios of compound angles**

When we add or subtract angles, the result is
called a compound angle. i.e.,the algebraic sum of two or more angles are
called compound angles

For example, If *A, B, C* are three angles then *A
± B, A + B + C, A – B + C* etc., are compound angles.

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11th Business Mathematics and Statistics(EMS) : Chapter 4 : Trigonometry : Trigonometric ratios of compound angles | Definition, Formula, Solved Example Problems, Exercise | Mathematics

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