10. Verify the Identity: sin O sec 0 = cos 0- cos 20. Are there any angles for which the identity does not tan 0+ cot 0 work? Sin?a COS e-cos26

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.3: Trigonometric Functions Of Real Numbers
Problem 23E
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Question 10 on the sheet is my question. How do you know what angles to restrict?

sin
12
Excluded
Use the sum and difference identities to verify the identity:
9.
tan 0-1
tan 0+
1+tan 0
sin O sec 0
= cos 0-cos 20. Are there any angles for which the identity does not
COS O-cos26
10. Verify the Identity:
tan 0+ cot 0
Sin?o
work?
Co
cofo-e1sint
Sin's
sin e
502
att angles except
CO se
Sime
34
11. Use the half-angle formulas to find the exact value of cos 7.5.
Simplify only to where your expression no longer contains any trigonometric functions.
Cos 2
14 COS X
COS
COs
15
I+ Cos15
%3D
2.
Ma
COS 30
Transcribed Image Text:sin 12 Excluded Use the sum and difference identities to verify the identity: 9. tan 0-1 tan 0+ 1+tan 0 sin O sec 0 = cos 0-cos 20. Are there any angles for which the identity does not COS O-cos26 10. Verify the Identity: tan 0+ cot 0 Sin?o work? Co cofo-e1sint Sin's sin e 502 att angles except CO se Sime 34 11. Use the half-angle formulas to find the exact value of cos 7.5. Simplify only to where your expression no longer contains any trigonometric functions. Cos 2 14 COS X COS COs 15 I+ Cos15 %3D 2. Ma COS 30
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