Lesson#5 <br />• Fundamental Trigonometric Identities <br />Math.Ex.9.2, Part5(9.2) <br /> For any real number , we shall derive the following fundamental trigonometric identities: <br />1) sin(−)=−sin <br />• Points to Remember: <br />1) sin is coordinate of point and cosec is reciprocal of coordinate. <br />2) cos is coordinate of point and sec is reciprocal of coordinate. <br />Chapter No. 9 <br />Fundamentals of Trigonometry <br />Exercise No. 9.2 <br />mathematics <br />part 1
