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ubrey tried to prove that sin(0) = cos(180° – 0) using the following diagram. Her proof is not correct. C A B

ubrey tried to prove that sin(0) = cos(180° – 0) using the following diagram. Her proof is not correct. C A B

Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.6: Additional Trigonometric Graphs
Problem 63E
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Aubrey tried to prove that sin(0) = cos(180° – 0) using the following diagram. Her proof is not correct. C A В Statement Reason 1 mLC = 180° – 0 The interior angle measures in a triangle sum to 180°. AC sin(0) : Definition of sine. ВС АС cos(180° – 0) : 3 Definition of cosine. - ВС 4 sin(0) = cos(180° – 0) Substitution What is the first mistake in Aubrey's proof?
Transcribed Image Text:Aubrey tried to prove that sin(0) = cos(180° – 0) using the following diagram. Her proof is not correct. C A В Statement Reason 1 mLC = 180° – 0 The interior angle measures in a triangle sum to 180°. AC sin(0) : Definition of sine. ВС АС cos(180° – 0) : 3 Definition of cosine. - ВС 4 sin(0) = cos(180° – 0) Substitution What is the first mistake in Aubrey's proof?
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