In Exercises 1 4, find the exact value of the expression 1 sin 12 cos 4 cos 12 sin 4 2 cos 16 cos 3 16 sin 16 sin 3 16 3 cos 130 cos 10 sin 130 sin 10 4 sin 100 cos 40 cos 100 sin 40 ...

1 sin 12 cos 4 cos 12 sin 4 sin 12 4 sin 3 3 2 2 cos 16 ...

In Exercises 1-4, find the exact value of the expression. 1. sin / 12 cos

Question:

In Exercises 1-4, find the exact value of the expression.
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°