如图,\(AB\)、\(BF\)分别是\(⊙O\)的直径和弦,弦\(CD\)与\(AB\)、\(BF\)分别相交于点\(E\)、\(G\),过点\(F\)的切线\(HF\)与\(DC\)的延长线相交于点\(H\),且\(HF=HG\).
\((1)\)求证:\(AB⊥CD\);
\((2)\)若\(\sin ∠HGF=\dfrac{3}{4} \),\(BF=3\),求\(⊙O\)的半径长.
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