david410 david410 01-05-2017 Mathematics contestada Suppose a triangle has sides a, b, and c, and let be the angle opposite the side of length a. If cos > 0, what must be true? A.b2 + c2 > a2 B.a2 + b2 > c2 C.b2 + c2 < a2 D.a2 + b2 = c2