Half Angle Formulas - How to Use

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

0:06 Formulas for the Sine,  Cosine, and Tangent Half Angle Formulas
0:48 Example 1 Sec(theta/2)
2:14 Visual Representation of the Half Angle
2:32 Example 2 Cot(Theta/2)
3:19 Example 3 Using the Cosine Half Angle Identity to Simplify
3:58 Example 4 Sine 112.5
4:36 Explanation of Whether Sine is Positive or Negative
6:08 Explanation of How the Formulas Give Us an Exact Answer
6:30 Example 5 Cos(3pi/8)

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