RD Sharma Solutions for Class 11 Maths Chapter 9 Values of Trignometric Functions at Multiples and Submultiples of an Angle

If A is an angle, then 2A, 3A, 4A etc. are called ‘multiple’ angles of A and A/2, A/3 etc. are called ‘sub multiple’ angles of A. Trigonometry is flooded with the formulae of multiple and submultiple of an angle, and these formulae are extremely important as they often fetch some direct questions in the exam.