向量OA=(2,0),OB=(2+2cosx,2*根号3+2sinx),则向量OA与向量OB的夹角的范围是:A、[0,π/4] B、[π/6,π/2] C、[5π/12,π/2] D、[π/12,5π/12]1楼,我是用那个公式做的,但是算不下去,你可以推一下试试。
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![向量OA=(2,0),OB=(2+2cosx,2*根号3+2sinx),则向量OA与向量OB的夹角的范围是:A、[0,π/4] B、[π/6,π/2] C、[5π/12,π/2] D、[π/12,5π/12]1楼,我是用那个公式做的,但是算不下去,你可以推一下试试。](/uploads/image/z/5183800-16-0.jpg?t=%E5%90%91%E9%87%8FOA%3D%EF%BC%882%2C0%EF%BC%89%2COB%3D%EF%BC%882%2B2cosx%2C2%2A%E6%A0%B9%E5%8F%B73%2B2sinx%EF%BC%89%2C%E5%88%99%E5%90%91%E9%87%8FOA%E4%B8%8E%E5%90%91%E9%87%8FOB%E7%9A%84%E5%A4%B9%E8%A7%92%E7%9A%84%E8%8C%83%E5%9B%B4%E6%98%AF%3AA%E3%80%81%5B0%2C%CF%80%2F4%5D+B%E3%80%81%5B%CF%80%2F6%2C%CF%80%2F2%5D+C%E3%80%81%5B5%CF%80%2F12%2C%CF%80%2F2%5D+D%E3%80%81%5B%CF%80%2F12%2C5%CF%80%2F12%5D1%E6%A5%BC%EF%BC%8C%E6%88%91%E6%98%AF%E7%94%A8%E9%82%A3%E4%B8%AA%E5%85%AC%E5%BC%8F%E5%81%9A%E7%9A%84%EF%BC%8C%E4%BD%86%E6%98%AF%E7%AE%97%E4%B8%8D%E4%B8%8B%E5%8E%BB%EF%BC%8C%E4%BD%A0%E5%8F%AF%E4%BB%A5%E6%8E%A8%E4%B8%80%E4%B8%8B%E8%AF%95%E8%AF%95%E3%80%82)
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