三角锥o-ABC,OA、OB、OC两两垂直且相等,点P、Q分别为BC、OA上的动点,且满足1/3BC≤BP≤2/3BC ,1/3OA≤OQ≤2/3OA,则PQ和OB所成角夹角的余弦值的取值范围?
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![三角锥o-ABC,OA、OB、OC两两垂直且相等,点P、Q分别为BC、OA上的动点,且满足1/3BC≤BP≤2/3BC ,1/3OA≤OQ≤2/3OA,则PQ和OB所成角夹角的余弦值的取值范围?](/uploads/image/z/8406112-40-2.jpg?t=%E4%B8%89%E8%A7%92%E9%94%A5o-ABC%2COA%E3%80%81OB%E3%80%81OC%E4%B8%A4%E4%B8%A4%E5%9E%82%E7%9B%B4%E4%B8%94%E7%9B%B8%E7%AD%89%2C%E7%82%B9P%E3%80%81Q%E5%88%86%E5%88%AB%E4%B8%BABC%E3%80%81OA%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9%2C%E4%B8%94%E6%BB%A1%E8%B6%B31%2F3BC%E2%89%A4BP%E2%89%A42%2F3BC+%2C1%2F3OA%E2%89%A4OQ%E2%89%A42%2F3OA%2C%E5%88%99PQ%E5%92%8COB%E6%89%80%E6%88%90%E8%A7%92%E5%A4%B9%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%3F)
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