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當點P向雙曲線右下方無限移動時,直線PF逐漸與漸近線平行,但是永不平行,所以傾斜角大於45°; 當點P逐漸靠近頂點時,傾斜角逐漸增大,但是小於180°. 所以直線PF的傾斜角的範圍是(45°,180°). 由此可知直線PF的斜率的變化範圍(-∞,0)∪(1,+∞).
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