# Compute using Trig Identities 3

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Taught by YourMathGal
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Part of video series
Meets NCTM Standards:
Lesson Summary:

In this lesson, Julie Harland demonstrates how to use trig identities to compute the sine and tangent of certain angles. Specifically, she uses the half-angle identity to find the exact value of sine of 157.5 degrees and tangent of 157.5 degrees. She walks through the process step-by-step and provides helpful tips along the way. By the end of the lesson, viewers will have a better understanding of half-angle identities and how to use them in computations.

Lesson Description:

Using Trig Identities to make computations.

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com

Questions answered by this video:
• How do you make computations using trig identities?
• How do you use a half angle identity to find the exact value of sin(157.5) and tan(157.5)?
• How can you use half angle trig identities to find exact values of sin and cosine of angles?
• #### Staff Review

• Currently 4.0/5 Stars.
This lesson shows how to compute exact values of sin and cos of odd angle measures using half angle identities. All steps involved in making the computations are shown and explained very clearly in this lesson. Check out the next lessons in this series for more example problems.