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Home > INT3 > Chapter 11 > Lesson 11.2.4 > Problem 11-104

11-104.

Solve each equation for . No calculator should be necessary.

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    In which quadrants is cosine negative? Sketch a unit circle with right triangles with angles at the origin in the second and third quadrants. What are the circular angles?

    and

    Now convert the angles into radians.

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    See part (a).

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    If .

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    Remember the side ratios of right triangles.

Compute without a calculator