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y=tanx的增區間是 (-π/2+kπ,π/2+kπ)(k∈Z) 把3x+π/6整體代換 使他滿足x的單調增區間 -π/2+kπ<3x+π/6<π/2+kπ -2π/3+kπ<3x<π/3+kπ 所以單調遞增區間為(-2π+3kπ,π+3kπ)
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