6.5. Trigonometric Equations http://www.ck12.org
- 3 sinx=2 cos^2 x
- tanxsin^2 x=tanx
- sin^2 x+ 1 =2 sinx
- sec^2 x= 4
- sin^2 x− 4 =cos^2 x−cos 2x− 4
The various trigonometric identities were introduced, proved and added to your toolbox. You learned what proofs
look like in trigonometry and used the identities to derive the identities themselves. You solved trigonometric
equations and bridged the connection between analytic trigonometry, which is very algebraic, with graphical repre-
sentations.