19、(2009•梅州)如图,矩形ABCD中,AB=5,AD=3.点E是CD上的动点,以AE为直径的⊙O与AB交于点F,过点F作FG⊥BE于点G.(1)当E是CD的中点时:①tan∠EAB的值为65;②证明:FG是⊙O的切线;(2)试探
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![19、(2009•梅州)如图,矩形ABCD中,AB=5,AD=3.点E是CD上的动点,以AE为直径的⊙O与AB交于点F,过点F作FG⊥BE于点G.(1)当E是CD的中点时:①tan∠EAB的值为65;②证明:FG是⊙O的切线;(2)试探](/uploads/image/z/12136490-26-0.jpg?t=19%E3%80%81%EF%BC%882009%26%238226%3B%E6%A2%85%E5%B7%9E%EF%BC%89%E5%A6%82%E5%9B%BE%2C%E7%9F%A9%E5%BD%A2ABCD%E4%B8%AD%2CAB%3D5%2CAD%3D3%EF%BC%8E%E7%82%B9E%E6%98%AFCD%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9%2C%E4%BB%A5AE%E4%B8%BA%E7%9B%B4%E5%BE%84%E7%9A%84%E2%8A%99O%E4%B8%8EAB%E4%BA%A4%E4%BA%8E%E7%82%B9F%2C%E8%BF%87%E7%82%B9F%E4%BD%9CFG%E2%8A%A5BE%E4%BA%8E%E7%82%B9G%EF%BC%8E%EF%BC%881%EF%BC%89%E5%BD%93E%E6%98%AFCD%E7%9A%84%E4%B8%AD%E7%82%B9%E6%97%B6%EF%BC%9A%E2%91%A0tan%E2%88%A0EAB%E7%9A%84%E5%80%BC%E4%B8%BA65%EF%BC%9B%E2%91%A1%E8%AF%81%E6%98%8E%EF%BC%9AFG%E6%98%AF%E2%8A%99O%E7%9A%84%E5%88%87%E7%BA%BF%EF%BC%9B%EF%BC%882%EF%BC%89%E8%AF%95%E6%8E%A2)
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