
Trigonometry (11th Edition)
11th Edition
ISBN: 9780134217437
Author: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher: PEARSON
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Question

Transcribed Image Text:10.
The steps used by a student to simplify the expression (sin x+cos x)² are
shown below
Step 1:
sin²x+cos²x
Step 2:
sin²x+(1-sin² x)
Step 3:
(1-cos²x)+(1−sin²x)
Step 4: 2-sin²x-cos²x
Explain which step contains error and give the correct final simplified expression.
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