在△ABC中,角ABC所对边分别是abc且cosA=1/4 (1)求sin²B+C/2+cos2A的值 (2)若a=4,b+c=6,且b小于c求bc
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![在△ABC中,角ABC所对边分别是abc且cosA=1/4 (1)求sin²B+C/2+cos2A的值 (2)若a=4,b+c=6,且b小于c求bc](/uploads/image/z/2501417-65-7.jpg?t=%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E8%A7%92ABC%E6%89%80%E5%AF%B9%E8%BE%B9%E5%88%86%E5%88%AB%E6%98%AFabc%E4%B8%94cosA%3D1%2F4+%EF%BC%881%EF%BC%89%E6%B1%82sin%26%23178%3BB%2BC%2F2%2Bcos2A%E7%9A%84%E5%80%BC+%EF%BC%882%EF%BC%89%E8%8B%A5a%3D4%2Cb%2Bc%3D6%2C%E4%B8%94b%E5%B0%8F%E4%BA%8Ec%E6%B1%82bc)
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