Trig Identities worksheet 3.3 featuring six equations to verify using trigonometric identities.

9. $\frac{\cot w}{\cos w} + \frac{\sec w}{\cot w} = \sec^2 w \csc w$

10. $2\sin^2 y - 1 = 1 - 2\cos^2 y$

11. $\sec y - \tan y \sin y = \cos y$

12. $(1 - \cos^2 \theta)(\cot^2 \theta + 1) = 1$

13. $\frac{1 - \sin^2 \theta}{1 + \tan^2 \theta} = \cos^4 \theta$

14. $\frac{\sin t}{\csc t} + \frac{\cos t}{\sec t} = 1$

15. $\frac{\sin y + \tan y}{1 + \sec y} = \sin y$

16. $\frac{1 - \tan^2 w}{1 + \tan^2 w} = 2\cos^2 w - 1$