Compute using Trig Identities 4

Sick of ads?‚Äč Sign up for MathVids Premium
Taught by YourMathGal
  • Currently 4.0/5 Stars.
1382 views | 1 rating
Part of video series
Meets NCTM Standards:
Lesson Description:

Using Trig Identities to make computations.

More free YouTube videos by Julie Harland are organized at

Questions answered by this video:
  • How do you make computations using trig identities?
  • If sin(A/2) = 1/5, what does cosA equal?
  • How do you find cosA if you know sin(A/2)?
  • Staff Review

    • Currently 4.0/5 Stars.
    This lesson shows how to compute cos of an angle if you know the value of sin of half the angle. The double angle identity is used to find the angle. 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.