1. a. sin 30ºb. cos 30ºc. tan 30º d. sin 60ºe. cos 60ºf. tan 60º g. sin 45ºh. cos 45ºi. tan 45º 6-25. COPY THE TRIANGLES AT RIGHT ONTO YOUR PAPER AND LABEL THE MISSING SIDE LENGTHS AND ANGLE MEASURES. THEN USE THE DIAGRAMS TO WRITE EACH TRIG RATIO BELOW AS AN EXACT VALUE (FRACTION). 2 1

2. February 18, 2016 6.1.3 SPECIAL RIGHT TRIANGLES AND TRIGONOMETRY

3.  CO: SWBAT use trigonometric ratios and their knowledge of special right triangles to prove a trigonometric identity.  LO: SWBAT explain their thinking in proving trigonometric identities. OBJECTIVES

4. 6-26. EXAMINE THE DIAGRAM AT RIGHT.

5. 6-27. TESTING EXAMPLES AS YOU DID IN PART (C) OF PROBLEM 6-26 CAN GIVE YOU AN IDEA OF WHETHER A STATEMENT IS USUALLY TRUE. BUT TO TEST WHETHER IT IS ALWAYS TRUE, YOU NEED TO PROVE A GENERAL CASE. SOMETIMES IT HELPS TO START WITH A THEOREM THAT YOU HAVE ALREADY PROVED.