Lesson#1 <br />Chapter 10 <br />Trigonometric Identities <br />Toolkit for Exercise 10.1 <br />Fundamental Law of Trigonometry <br />1) cos(−)=cos cos+sin sin <br />Math.Ex.10.1, Part1(10.1), <br />What are Allied Angles ? <br />Allied Angles: A group of angles is said to be allied if sum or difference of any two of them gives integral multiple of 90° /2. <br />How can we generate Allied Angles? <br />What is the use of the concept of Allied angles ? <br />The concept of allied angles is used to find trigonometric functional values of numerically large angles. <br />Drawback of the use of the concept of Coterminal Angles: <br />Trigonometric Identities <br />Chapter No 10 <br />Exercise No 10.1 <br />Mathematics <br />part 1
