函数y=sin(π/4-2x)的单调增区间是?为什么把(π/4-2x)=u带入做 即 2kπ-π/2≤ (π/4-2x) ≤2kπ+π/2是错误的?和把函数化简成-sin(2x-π/4)再代入得的值不一样?上面有个错误 第一行的不等式为2kπ+π/
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![函数y=sin(π/4-2x)的单调增区间是?为什么把(π/4-2x)=u带入做 即 2kπ-π/2≤ (π/4-2x) ≤2kπ+π/2是错误的?和把函数化简成-sin(2x-π/4)再代入得的值不一样?上面有个错误 第一行的不等式为2kπ+π/](/uploads/image/z/2832443-35-3.jpg?t=%E5%87%BD%E6%95%B0y%3Dsin%EF%BC%88%CF%80%2F4-2x%29%E7%9A%84%E5%8D%95%E8%B0%83%E5%A2%9E%E5%8C%BA%E9%97%B4%E6%98%AF%3F%E4%B8%BA%E4%BB%80%E4%B9%88%E6%8A%8A%EF%BC%88%CF%80%2F4-2x%EF%BC%89%3Du%E5%B8%A6%E5%85%A5%E5%81%9A+%E5%8D%B3+2k%CF%80-%CF%80%2F2%E2%89%A4+%EF%BC%88%CF%80%2F4-2x%EF%BC%89+%E2%89%A42k%CF%80%2B%CF%80%2F2%E6%98%AF%E9%94%99%E8%AF%AF%E7%9A%84%3F%E5%92%8C%E6%8A%8A%E5%87%BD%E6%95%B0%E5%8C%96%E7%AE%80%E6%88%90-sin%282x-%CF%80%2F4%29%E5%86%8D%E4%BB%A3%E5%85%A5%E5%BE%97%E7%9A%84%E5%80%BC%E4%B8%8D%E4%B8%80%E6%A0%B7%3F%E4%B8%8A%E9%9D%A2%E6%9C%89%E4%B8%AA%E9%94%99%E8%AF%AF+%E7%AC%AC%E4%B8%80%E8%A1%8C%E7%9A%84%E4%B8%8D%E7%AD%89%E5%BC%8F%E4%B8%BA2k%CF%80%2B%CF%80%2F)
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