In Exercises 1-4, find the exact value of the trigonometric expression given that tan u = 3

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In Exercises 1-4, find the exact value of the trigonometric expression given that tan u = 3 / 4 and cos v = - 4 / 5.( u is in Quadrant I and v is in Quadrant III).
1. sin (y + v)
2. tan (u + v)
3. cos (u - v)
4. sin (u - v)
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