# Trigonometry: Trigonometric Identities II

## introduction

Mobile Devices:

Tablets and smartphones can access the Trigonometric Identities II Animations on YouTube.

Workbook:

Download and print the Trigonometric Identities II Workbook.

Practice Exam:

Download and print the Unit Five Practice Exam.

Interactive Graphs:

All of the Trigonometric Identities II Graphs are interactive on Desmos.

Lesson Transcript:

All of the Trigonometric Identities II Notes are available as a video transcript.

Topics Covered:

- sum and difference identities.
- double-angle identities.
- exact values of sine and cosine for angles not found on the standard unit circle.
- proofs using sum, difference, and double-angle identities.
- equations using sum, difference, and double-angle identities.
- problem solving with trigonometric identities. (geometry, cannonball trajectory, tunnel engineering, speaker interference, proof of sum and difference identities)

WNCP Curriculum Connection: Trigonometry, Specific Outcome 6

Videos: Desktop computers and laptops require Adobe Flash Player and the printable notes require Adobe Reader. Smartphones and tablets will not be able access the Flash content on this page (resulting in empty space below). Use the YouTube alternative.