Ch. 1 - Angles and the Trigonometric Functions
Chapter 1, Problem 20
In Exercises 19–24, a. Use the unit circle shown for Exercises 5–18 to find the value of the trigonometric function. b. Use even and odd properties of trigonometric functions and your answer from part (a) to find the value of the same trigonometric function at the indicated real number. cos 𝜋/3
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