Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.7: Distinguishable Permutations And Combinations
Problem 13E
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The unit circle has been divided into eight equal arcs, corresponding to t-values of 0, π/4, π/2, 3π/4, π, 5π/4, 3π/2, 7π/4, and 2π. Solve, part a. Use the (x, y) coordinates in the figure to find the value of the trigonometric functions a) cos 7π/4 b) cos 47π/4. Part b. Use periodic properties and your answer from part (a) to find the value of the same trigonometric function at the indicated real number.
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