判断下列命题正误,并证明.1.sin^2A+sin^2B+sin^2C0,则△ABC为锐角三角形.
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![判断下列命题正误,并证明.1.sin^2A+sin^2B+sin^2C0,则△ABC为锐角三角形.](/uploads/image/z/6847341-69-1.jpg?t=%E5%88%A4%E6%96%AD%E4%B8%8B%E5%88%97%E5%91%BD%E9%A2%98%E6%AD%A3%E8%AF%AF%2C%E5%B9%B6%E8%AF%81%E6%98%8E.1.sin%5E2A%2Bsin%5E2B%2Bsin%5E2C0%2C%E5%88%99%E2%96%B3ABC%E4%B8%BA%E9%94%90%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2.)
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