In Exercises 119122, use the product-to-sum formulas to write the product as a sum or
Chapter 6, Problem 121(choose chapter or problem)
In Exercises 119–122, use the product-to-sum formulas to write the product as a sum or difference.
\(\sin 5 \alpha \sin 4 \alpha\)
Text Transcription:
sin 5 alpha sin 4 alpha
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