1 在三角形ABC中,若AB与BC的数量积小于0,则三角形形状A 锐角三角形B直角 C钝角 D不能确定2 复平面上的动点Q 横坐标(COSA+SINA)/(1+COSA*COSA) 纵坐标(COSA*SINA)/(1+COSA*SINA),轨迹为?A圆 B椭圆 C
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![1 在三角形ABC中,若AB与BC的数量积小于0,则三角形形状A 锐角三角形B直角 C钝角 D不能确定2 复平面上的动点Q 横坐标(COSA+SINA)/(1+COSA*COSA) 纵坐标(COSA*SINA)/(1+COSA*SINA),轨迹为?A圆 B椭圆 C](/uploads/image/z/6990503-23-3.jpg?t=1+%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E8%8B%A5AB%E4%B8%8EBC%E7%9A%84%E6%95%B0%E9%87%8F%E7%A7%AF%E5%B0%8F%E4%BA%8E0%2C%E5%88%99%E4%B8%89%E8%A7%92%E5%BD%A2%E5%BD%A2%E7%8A%B6A+%E9%94%90%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2B%E7%9B%B4%E8%A7%92+C%E9%92%9D%E8%A7%92+D%E4%B8%8D%E8%83%BD%E7%A1%AE%E5%AE%9A2+%E5%A4%8D%E5%B9%B3%E9%9D%A2%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9Q+%E6%A8%AA%E5%9D%90%E6%A0%87%EF%BC%88COSA%2BSINA%EF%BC%89%2F%EF%BC%881%2BCOSA%2ACOSA%EF%BC%89+%E7%BA%B5%E5%9D%90%E6%A0%87%EF%BC%88COSA%2ASINA%EF%BC%89%2F%EF%BC%881%2BCOSA%2ASINA%EF%BC%89%2C%E8%BD%A8%E8%BF%B9%E4%B8%BA%3FA%E5%9C%86+B%E6%A4%AD%E5%9C%86+C)
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