f(x)=sinx是有界函数,|sinx|≤1,1是它的界,|sinx|≤2,2也是它的界,那3呢?4呢?函数图象显示值域上限为1,下限为-1啊,跟2和-2有什么关系?
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![f(x)=sinx是有界函数,|sinx|≤1,1是它的界,|sinx|≤2,2也是它的界,那3呢?4呢?函数图象显示值域上限为1,下限为-1啊,跟2和-2有什么关系?](/uploads/image/z/6801322-58-2.jpg?t=f%28x%29%3Dsinx%E6%98%AF%E6%9C%89%E7%95%8C%E5%87%BD%E6%95%B0%2C%7Csinx%7C%E2%89%A41%2C1%E6%98%AF%E5%AE%83%E7%9A%84%E7%95%8C%2C%7Csinx%7C%E2%89%A42%2C2%E4%B9%9F%E6%98%AF%E5%AE%83%E7%9A%84%E7%95%8C%2C%E9%82%A33%E5%91%A2%3F4%E5%91%A2%3F%E5%87%BD%E6%95%B0%E5%9B%BE%E8%B1%A1%E6%98%BE%E7%A4%BA%E5%80%BC%E5%9F%9F%E4%B8%8A%E9%99%90%E4%B8%BA1%2C%E4%B8%8B%E9%99%90%E4%B8%BA-1%E5%95%8A%2C%E8%B7%9F2%E5%92%8C-2%E6%9C%89%E4%BB%80%E4%B9%88%E5%85%B3%E7%B3%BB%3F)
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