函数f(x)=sinx(sinx-cosx)的单调递减区间?A[2kπ+π/8,2kπ+5/8π] B[kπ+π/8,kπ+5/8π] C[2kπ-3/8π,2kπ+π/8] D[kπ-3/8π,kπ+π/8] (全部k属于Z)
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![函数f(x)=sinx(sinx-cosx)的单调递减区间?A[2kπ+π/8,2kπ+5/8π] B[kπ+π/8,kπ+5/8π] C[2kπ-3/8π,2kπ+π/8] D[kπ-3/8π,kπ+π/8] (全部k属于Z)](/uploads/image/z/616075-43-5.jpg?t=%E5%87%BD%E6%95%B0f%28x%29%3Dsinx%28sinx-cosx%29%E7%9A%84%E5%8D%95%E8%B0%83%E9%80%92%E5%87%8F%E5%8C%BA%E9%97%B4%3FA%5B2k%CF%80%2B%CF%80%2F8%2C2k%CF%80%2B5%2F8%CF%80%5D+B%5Bk%CF%80%2B%CF%80%2F8%2Ck%CF%80%2B5%2F8%CF%80%5D+C%5B2k%CF%80-3%2F8%CF%80%2C2k%CF%80%2B%CF%80%2F8%5D+D%5Bk%CF%80-3%2F8%CF%80%2Ck%CF%80%2B%CF%80%2F8%5D+%EF%BC%88%E5%85%A8%E9%83%A8k%E5%B1%9E%E4%BA%8EZ%EF%BC%89)
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