Given
Angles u and v are in quadrant 2.
A right triangle can be drawn in quadrant 2. Since we know that the side opposite angle u is 5 and the hypotenuse of the triangle is 13. Using the pythagorean theorem the third side of the triangle is 12.
A second triangle can be drawn in quadrant 2. Since we know that the side adjacent angle v is 3 and the hypotenuse of the triangle is 5. Using the pythagorean theorem the third side of the triangle is 4.
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