Can someone explain what is happening at each step in detail plz. (If you can explain it in detail/paragraphs it would be great) Can you also talk about the tri identities used and strategies that were applied in the steps!

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.1: Verifying Trigonometric Identities
Problem 66E
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Need Help with grade 11 trig homework

Can someone explain what is happening at each step in detail plz. (If you can explain it in detail/paragraphs it would be great) Can you also talk about the tri identities used and strategies that were applied in the steps!

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