In Exercises 1-4, find the exact value of the expression. 1. sin / 12 cos
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1. sin π / 12 cos π / 4 + cos π / 12 sin π / 4
2. cos π / 16 cos 3 π / 16 - sin π / 16 sin 3 π / 16
3. cos 130° cos 10° + sin 130° sin 10°
4. sin 100° cos 40° − cos 100° sin 40°
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