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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. For more details use the links given below:
Click here → Study Material of Trigonometric Ratios of Multiple and Sub Multiple Angles
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Chapter 9: Trigonometric Ratios of Multiple and...