选择题:△ABC 的内角 A, B, C 所对边分别为 a, b, c, 若 b=3, c=2, △ABC 的面积为 2sinB, 则 cosA=()

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题目内容:

△ABC 的内角 A, B, C 所对边分别为 a, b, c, 若 b=3, c=2, △ABC 的面积为 2sinB, 则 cosA=()

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A.A

B.B

C.C

D.D

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