若|cosa|=-cosa,则x取值范围A.2kπ≤x≤2kπ+π/2(k∈Z)B.2kπ+π/2≤x≤2kπ+3π/2(k∈Z)C.2kπ+3π/2≤x≤2kπ+2π(k∈Z)D.2kπ+π≤x≤2kπ+3π/2(k∈Z)最好有原因
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![若|cosa|=-cosa,则x取值范围A.2kπ≤x≤2kπ+π/2(k∈Z)B.2kπ+π/2≤x≤2kπ+3π/2(k∈Z)C.2kπ+3π/2≤x≤2kπ+2π(k∈Z)D.2kπ+π≤x≤2kπ+3π/2(k∈Z)最好有原因](/uploads/image/z/6800973-69-3.jpg?t=%E8%8B%A5%7Ccosa%7C%3D-cosa%2C%E5%88%99x%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4A.2k%CF%80%E2%89%A4x%E2%89%A42k%CF%80%2B%CF%80%2F2%28k%E2%88%88Z%29B.2k%CF%80%2B%CF%80%2F2%E2%89%A4x%E2%89%A42k%CF%80%2B3%CF%80%2F2%28k%E2%88%88Z%29C.2k%CF%80%2B3%CF%80%2F2%E2%89%A4x%E2%89%A42k%CF%80%2B2%CF%80%28k%E2%88%88Z%29D.2k%CF%80%2B%CF%80%E2%89%A4x%E2%89%A42k%CF%80%2B3%CF%80%2F2%28k%E2%88%88Z%29%E6%9C%80%E5%A5%BD%E6%9C%89%E5%8E%9F%E5%9B%A0)
若|cosa|=-cosa,则x取值范围A.2kπ≤x≤2kπ+π/2(k∈Z)B.2kπ+π/2≤x≤2kπ+3π/2(k∈Z)C.2kπ+3π/2≤x≤2kπ+2π(k∈Z)D.2kπ+π≤x≤2kπ+3π/2(k∈Z)最好有原因
若|cosa|=-cosa,则x取值范围
A.2kπ≤x≤2kπ+π/2(k∈Z)
B.2kπ+π/2≤x≤2kπ+3π/2(k∈Z)
C.2kπ+3π/2≤x≤2kπ+2π(k∈Z)
D.2kπ+π≤x≤2kπ+3π/2(k∈Z)
最好有原因
若|cosa|=-cosa,则x取值范围A.2kπ≤x≤2kπ+π/2(k∈Z)B.2kπ+π/2≤x≤2kπ+3π/2(k∈Z)C.2kπ+3π/2≤x≤2kπ+2π(k∈Z)D.2kπ+π≤x≤2kπ+3π/2(k∈Z)最好有原因
满足第二第三象限的x可以.选D
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