Chapter 5
Chapter 5
Chapter 5
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The Sum-to-Product Identities (for sines)<br />
Proof.<br />
<br />
u + v u − v<br />
sin u + sin v = 2 sin cos<br />
2<br />
2<br />
<br />
u + v u − v<br />
sin u − sin v = 2 cos sin<br />
2<br />
2