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 = - 7 / 25 and cos v = - 4 / 5.(both u and v are in Quadrant III).
1. cos(u + v)
2. sin(u + v)
3. tan(u − v)
4. cot(v − u)
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