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In triangle STU, s = 9 cm, t = 15 cm, and m angle U = 37 degrees. Find u.
|dw:1369857053248:dw| use the cosine rule : u^2 = s^2 + t^2 - 2 * s * t * cosU u^2 = 9^2 + 15^2 - 2 * 9 * 15 cos37 solve for u (simplify and use the calculator)