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9-76.
  1. What reference angle can you use to calculate the sine and cosine of each of the following angles? Refer to the Math Notes box in this lesson. 9-76 HW eTool (Desmos). Homework Help ✎

    1. 330º

    2. 120º

    3. 113º

    4. 203º

30°

60°

Use the eTool below to find the needed reference angles.
Click the link to the right for full version: INT3 9-76 HW eTool.