下列函数中,周期为π,且在【π/4,π/2】上为减函数的是:A y=sin(2x+π/2)B y=cos(2x+π/2)C y=sin(x+π/2)D y=cos(x+π/2)要有解答过程我怀疑这是道错题!
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![下列函数中,周期为π,且在【π/4,π/2】上为减函数的是:A y=sin(2x+π/2)B y=cos(2x+π/2)C y=sin(x+π/2)D y=cos(x+π/2)要有解答过程我怀疑这是道错题!](/uploads/image/z/3799002-66-2.jpg?t=%E4%B8%8B%E5%88%97%E5%87%BD%E6%95%B0%E4%B8%AD%2C%E5%91%A8%E6%9C%9F%E4%B8%BA%CF%80%2C%E4%B8%94%E5%9C%A8%E3%80%90%CF%80%2F4%2C%CF%80%2F2%E3%80%91%E4%B8%8A%E4%B8%BA%E5%87%8F%E5%87%BD%E6%95%B0%E7%9A%84%E6%98%AF%EF%BC%9AA+y%3Dsin%282x%2B%CF%80%2F2%EF%BC%89B+y%3Dcos%EF%BC%882x%2B%CF%80%2F2%EF%BC%89C+y%3Dsin%EF%BC%88x%2B%CF%80%2F2%EF%BC%89D+y%3Dcos%EF%BC%88x%2B%CF%80%2F2%EF%BC%89%E8%A6%81%E6%9C%89%E8%A7%A3%E7%AD%94%E8%BF%87%E7%A8%8B%E6%88%91%E6%80%80%E7%96%91%E8%BF%99%E6%98%AF%E9%81%93%E9%94%99%E9%A2%98%EF%BC%81)
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下列函数中,周期为π,且在【π/4,π/2】上为减函数的是:A y=sin(2x+π/2)B y=cos(2x+π/2)C y=sin(x+π/2)D y=cos(x+π/2)要有解答过程我怀疑这是道错题!
下列函数中,周期为π,且在【π/4,π/2】上为减函数的是:
A y=sin(2x+π/2)
B y=cos(2x+π/2)
C y=sin(x+π/2)
D y=cos(x+π/2)
要有解答过程
我怀疑这是道错题!
下列函数中,周期为π,且在【π/4,π/2】上为减函数的是:A y=sin(2x+π/2)B y=cos(2x+π/2)C y=sin(x+π/2)D y=cos(x+π/2)要有解答过程我怀疑这是道错题!
选A 因为周期为兀所以C D错,A可划为y=cos(2x) 又2x属于(兀/2,兀) 所以在x属于(兀/4,兀/2) 上函数递减
周期为π 所以C、D错
但AB都错
故无答案
怀疑是对的