当x是第三象限角时,化简根号下(1+cos2x)/cosx+根号下(1-cos2x)/sinx
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![当x是第三象限角时,化简根号下(1+cos2x)/cosx+根号下(1-cos2x)/sinx](/uploads/image/z/3856557-21-7.jpg?t=%E5%BD%93x%E6%98%AF%E7%AC%AC%E4%B8%89%E8%B1%A1%E9%99%90%E8%A7%92%E6%97%B6%2C%E5%8C%96%E7%AE%80%E6%A0%B9%E5%8F%B7%E4%B8%8B%281%2Bcos2x%29%2Fcosx%2B%E6%A0%B9%E5%8F%B7%E4%B8%8B%281-cos2x%29%2Fsinx)
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当x是第三象限角时,化简根号下(1+cos2x)/cosx+根号下(1-cos2x)/sinx
当x是第三象限角时,化简根号下(1+cos2x)/cosx+根号下(1-cos2x)/sinx
当x是第三象限角时,化简根号下(1+cos2x)/cosx+根号下(1-cos2x)/sinx
由x是第三象限角,故cosx