Question: In Exercises 1-4, use the sum-to-product formulas to find the exact value of the expression. 1. sin 75 + sin 15 2. cos 120 +

In Exercises 1-4, use the sum-to-product formulas to find the exact value of the expression.
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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