In Exercises 8992, use the sum-to-product formulas to find the exact value of the
Chapter 6, Problem 91(choose chapter or problem)
In Exercises 89–92, use the sum-to-product formulas to find the exact value of the expression.
\(\cos \frac{3 \pi}{4}-\cos \frac{\pi}{4}\)
Text Transcription:
cos 3 pi / 4 − cos pi / 4
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