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