NCERT Class 11-Math՚S: Exemplar Chapter 3 Trigonometric Functions Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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3.1. 8 Some formulae regarding compound angles

An angle made up of the sum or differences of two or more angles is called a compound angle. The basic results in this direction are called trigonometric identies as given below:





















(xxi) (xiii)



Trigonometric functions of an angle of


Therefore, nce,




Now, we can easily find and as follows: