2. : (a) For n ≥ 1, show that 1+z+2²+...+ 2¹: (b) Hence, show that 1+ cos 0 + cos 20 + 12+1 2 #1 7 1-z + cos n0 = =+ sin(n+¹)0 2 sin

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.4: Values Of The Trigonometric Functions
Problem 38E
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please do a) and b) , thanks??

2. :
(a) For n ≥ 1, show that 1+z+z²+...+ 2¹:
(b) Hence, show that 1+ cos 0 + cos 20 +
12+1
1-z
+ cos no = +
7,21
sin(n+¹)0
2 sin
Transcribed Image Text:2. : (a) For n ≥ 1, show that 1+z+z²+...+ 2¹: (b) Hence, show that 1+ cos 0 + cos 20 + 12+1 1-z + cos no = + 7,21 sin(n+¹)0 2 sin
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