In Exercises 1-4, find the exact value of the trigonometric expression given that sin u = -

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In Exercises 1-4, find the exact value of the trigonometric expression given that sin u = - 3 / 5, where 3 π / 2 < u < 2 π, and cos v = 15 / 17, where 0 < v < π / 2.
1. sin(u + v)
2. cos(u − v)
3. tan(u + v)
4. csc(u − v)
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