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一,圖象法:在同一坐標系內,畫出y=sinx,y=cosx在[0,2π]的圖象,由圖象可知:當x∈(π/4,5π/4)時,y=sinx的圖象高於y=cosx的圖象,所以sinx>cosx在[0,2π]內的解集為:(π/4,5π/4);由函數y=sinx,y=cosx都是最小正...
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