数学必修二:三角形ABC中,sinA的平方小于或等于sinB的平方+sinC的平方减sinBsinC.求A得取值范围.
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![数学必修二:三角形ABC中,sinA的平方小于或等于sinB的平方+sinC的平方减sinBsinC.求A得取值范围.](/uploads/image/z/5209285-13-5.jpg?t=%E6%95%B0%E5%AD%A6%E5%BF%85%E4%BF%AE%E4%BA%8C%EF%BC%9A%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CsinA%E7%9A%84%E5%B9%B3%E6%96%B9%E5%B0%8F%E4%BA%8E%E6%88%96%E7%AD%89%E4%BA%8EsinB%E7%9A%84%E5%B9%B3%E6%96%B9%2BsinC%E7%9A%84%E5%B9%B3%E6%96%B9%E5%87%8FsinBsinC.%E6%B1%82A%E5%BE%97%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.)
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