J32 For z = cos(x-4y) show that # дудхду 332 дугах

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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6. For z = cos(x-4y) show that
J3z
ду х?у
#
J32
ду2 х
Transcribed Image Text:6. For z = cos(x-4y) show that J3z ду х?у # J32 ду2 х
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