已知锐角A是三角形ABC的一个内角,abc是角ABC的对边,若sin^2(A)-cos^2(A)=1/2,则A b+c=2a B b+c
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![已知锐角A是三角形ABC的一个内角,abc是角ABC的对边,若sin^2(A)-cos^2(A)=1/2,则A b+c=2a B b+c](/uploads/image/z/350177-41-7.jpg?t=%E5%B7%B2%E7%9F%A5%E9%94%90%E8%A7%92A%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E4%B8%80%E4%B8%AA%E5%86%85%E8%A7%92%2Cabc%E6%98%AF%E8%A7%92ABC%E7%9A%84%E5%AF%B9%E8%BE%B9%2C%E8%8B%A5sin%5E2%28A%29-cos%5E2%28A%29%3D1%2F2%2C%E5%88%99A+b%2Bc%3D2a+B+b%2Bc)
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