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Chapter 5

Chapter 5

Chapter 5

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Ch 5.4 : The Product-to-Sum Identities<br />

Proof.<br />

cos α cos β = 1<br />

[cos(α + β) + cos(α − β)]<br />

2<br />

sin α sin β = 1<br />

[cos(α − β) − cos(α + β)]<br />

2

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