Trigonometry (MindTap Course List)
10th Edition
ISBN:9781337278461
Author:Ron Larson
Publisher:Ron Larson
Chapter4: Complex Numbers
Section4.4: Trigonometric Form Of A Complex Number
Problem 5ECP
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if cotx=-8/6, 3pi/2<x<2pi and tany=5/12, pi<y<3pi/2 find cos(x-y) and sin(x+y)

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