How to derive the Trigonometric ratio of special angles 30-45-60 MATH 9 Fourth (4th) quarter week 2

This video lesson discussed how to derive the trigonometric ratio of special angles 30-45-60. Special angles can be determined its trigonometric ratio without calculator. Mathematics 9 fourth quarter week 2. #trigonometricratio #specialangles #math9 #qrtr2 #quarter2 #week2