函数 y=[cos(x+2/5π)-1]/sin(x+2/5π)的递减区间是
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函数 y=[cos(x+2/5π)-1]/sin(x+2/5π)的递减区间是
输错了!函数 y=[cos(x+2π/5)-1]/sin(x+2π/5)的递减区间是
输错了!函数 y=[cos(x+2π/5)-1]/sin(x+2π/5)的递减区间是
y=[cos(x+2π/5)-1]/sin(x+2π/5)
=[1-2sin²(x/2+π/5)-1]/[2sin(x/2+π/5)cos(x/2+π/5)]
=-sin(x/2+π/5)/cos(x/2+π/5)
=-tan(x/2+π/5)
定义域sin(x/2+π/5)≠0,cos(x/2+π/5)≠0
∴x/2+π/5≠kπ/2,k∈Z
由 kπ/2
=[1-2sin²(x/2+π/5)-1]/[2sin(x/2+π/5)cos(x/2+π/5)]
=-sin(x/2+π/5)/cos(x/2+π/5)
=-tan(x/2+π/5)
定义域sin(x/2+π/5)≠0,cos(x/2+π/5)≠0
∴x/2+π/5≠kπ/2,k∈Z
由 kπ/2
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