How to Use Double Angle Formulas

Learn how to work with the Double Angle Formulas for sine, cosine, and tangent in this free math video tutorial by Mario's Math Tutoring.

0:11 Double angle formulas for sine, cosine, and tangent
1:01 Example 1 Given an angle find the trig ratios for double the angle
3:26 Example 2 Rewriting 8sinxcosx using double angles
4:24 Example 3  Rewriting 10cos^2(x) - 5
5:03 Example 4 Solving sin2x-sinx=0 using double angle formulas
6:33 Example 5 Solving cos2x+sinx=0

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