In Exercises 1-4, write the expression as the sine, cosine, or tangent of an angle. 1. sin
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1. sin 3 cos 1.2 − cos 3 sin 1.2
2. cos π / 7 cos π / 5 - sin π / 7 sin π / 5
3. sin 60° cos 15° + cos 60° sin 15°
4. cos 130° cos 40° − sin 130° sin 40°
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