In Exercises 1-4, use the sum-to-product formulas to find the exact value of the expression. 1. sin
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1. sin 75° + sin 15°
2. cos 120° + cos 60°
3. cos 3π / 4 - cos π / 4
4. sin 5π / 4 - sin 3π / 4
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1 sin 75 o sin 15 o 2 sin75 o 15 o 2 cos75 o 15 o 2 2 sin 45 ...View the full answer
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