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Sketch a unit circle. In your unit circle, sketch an angle that has:   

  1. A positive cosine and a negative sine.

  2. A sine of .

  3. A negative cosine and a negative sine.

  4. A cosine of approximately and a sine of approximately .

  5. Can an angle have a sine of and cosine of ? Give an example or explain why not.

    Use the eTool below to explore these ideas.
    Click the link at right for the full version of the eTool: INT3 9-53 HW eTool