已知三角形ABC中, 角C=90° , tanA= 二分之一,D是AC上一点,角CBD=角A,已知三角形ABC中, 角C=90° , tanA= 二分之一,D是AC上一点,角CBD=角A,则 sin角ABD=
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![已知三角形ABC中, 角C=90° , tanA= 二分之一,D是AC上一点,角CBD=角A,已知三角形ABC中, 角C=90° , tanA= 二分之一,D是AC上一点,角CBD=角A,则 sin角ABD=](/uploads/image/z/2501682-42-2.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C+%E8%A7%92C%3D90%C2%B0+%2C+tanA%3D+%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%2CD%E6%98%AFAC%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E8%A7%92CBD%3D%E8%A7%92A%2C%E5%B7%B2%E7%9F%A5%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C+%E8%A7%92C%3D90%C2%B0+%2C+++tanA%3D+%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%2CD%E6%98%AFAC%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E8%A7%92CBD%3D%E8%A7%92A%2C%E5%88%99++sin%E8%A7%92ABD%3D)
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