作业帮设全集U=R,A={y|y=tan x ,x∈B｝,B=｛x| |x|≤π/4 ｝,则图中阴影部分表示的集合是 A .[-1,1] B.[-π/4,π/4] C.[-1,-π/4)∪（π/4 ,1] D.[ -1,-π/4]∪[ π/4 ,1]
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![设全集U=R,A={y|y=tan x ,x∈B｝,B=｛x| |x|≤π/4 ｝,则图中阴影部分表示的集合是 A .[-1,1] B.[-π/4,π/4] C.[-1,-π/4)∪（π/4 ,1] D.[ -1,-π/4]∪[ π/4 ,1]](/uploads/image/z/3674551-31-1.jpg?t=%E8%AE%BE%E5%85%A8%E9%9B%86U%3DR%2CA%3D%7By%7Cy%3Dtan+x+%2Cx%E2%88%88B%EF%BD%9D%2CB%3D%EF%BD%9Bx%7C+%7Cx%7C%E2%89%A4%CF%80%2F4+%EF%BD%9D%2C%E5%88%99%E5%9B%BE%E4%B8%AD%E9%98%B4%E5%BD%B1%E9%83%A8%E5%88%86%E8%A1%A8%E7%A4%BA%E7%9A%84%E9%9B%86%E5%90%88%E6%98%AF++A+.%5B-1%2C1%5D++++++++B.%5B-%CF%80%2F4%2C%CF%80%2F4%5D++++++++++C.%5B-1%2C-%CF%80%2F4%29%E2%88%AA%EF%BC%88%CF%80%2F4+%2C1%5D++++++++D.%5B+-1%2C-%CF%80%2F4%5D%E2%88%AA%5B+%CF%80%2F4+%2C1%5D)
设全集U=R,A={y|y=tan x ,x∈B｝,B=｛x| |x|≤π/4 ｝,则图中阴影部分表示的集合是 A .[-1,1] B.[-π/4,π/4] C.[-1,-π/4)∪（π/4 ,1] D.[ -1,-π/4]∪[ π/4 ,1]
设全集U=R,A={y|y=tan x ,x∈B｝,B=｛x| |x|≤π/4 ｝,则图中阴影部分表示的集合是
A .[-1,1] B.[-π/4,π/4] C.[-1,-π/4)∪（π/4 ,1] D.[ -1,-π/4]∪[ π/4 ,1]
设全集U=R,A={y|y=tan x ,x∈B｝,B=｛x| |x|≤π/4 ｝,则图中阴影部分表示的集合是 A .[-1,1] B.[-π/4,π/4] C.[-1,-π/4)∪（π/4 ,1] D.[ -1,-π/4]∪[ π/4 ,1]
选c
不懂追问
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