Chapter 6: Q 127 (page 397)
Show that the period of is .
Short Answer
From the following graph of tangent function it is clear that the period of tangent function is .

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Chapter 6: Q 127 (page 397)
Show that the period of is .
From the following graph of tangent function it is clear that the period of tangent function is .

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In problems 13-20, is the point on the unit circle that corresponds to a real number . Find the exact values of the six trigonometric functions of .
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Use a calculator to find the approximate value of each expression rounded to two decimal places.
In Example 6, we found that the distance between Albuquerque, New Mexico, and Glasgow, Montana, is approximately 903 miles. According to mapquest.com, the distance is approximately 1300 miles. What might account for the difference?
Approximating the Circumference of Earth Eratosthenes of Cyrene (276–195 bc) was a Greek scholar who lived and worked in Cyrene and Alexandria. One day while visiting in
Syene he noticed that the Sun’s rays shone directly down a well. On this date 1 year later, in Alexandria, which is 500 miles due north of Syene he measured the angle of the Sun to be about 6.2 degrees. See the figure. Use this information to approximate the radius and circumference of Earth.
Convert each angle in degree to radians. express your answer as a multiple of .
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