ABSTRACT
Figure 50.1 summarises the trigonometric ratios for angles of any magnitude; the letters underlined spell the word CAST when starting in the fourth quadrant and moving in an anticlockwise direction. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429294402/968186b9-ffa4-4f2b-aa54-7fc58a604561/content/fig50_1.tif"/>
