y=根号下sinx+根号下-tanx
sinx大于等于0 (1)
-tanx大于等于0 (2)
(1)x∈[2Kπ,2Kπ+π]
(2) x∈[2Kπ+π/2,2Kπ+π] ∪x∈[2Kπ+3π/2,2Kπ+2π]
所以 函数:根号下sinx+根号下-tanx的定义域 x∈[2Kπ+π/2,2Kπ+π]
y=根号下sinx+根号下-tanx
sinx大于等于0 (1)
-tanx大于等于0 (2)
(1)x∈[2Kπ,2Kπ+π]
(2) x∈[2Kπ+π/2,2Kπ+π] ∪x∈[2Kπ+3π/2,2Kπ+2π]
所以 函数:根号下sinx+根号下-tanx的定义域 x∈[2Kπ+π/2,2Kπ+π]