已知:\(AB\)是\(\odot O\)的弦,点\(C\)是\({}^{︵}_{AB}\)的中点,连接\(OB\)、\(OC\),\(OC\)交\(AB\)于点\(D\).
\((1)\)如图\(1\),求证:\(AD=BD\);
\((2)\)如图\(2\),过点\(B\)作\(\odot O\)的切线交\(OC\)的延长线于点\(M\),点\(P\)是\(\overset\frown{AC}\)上一点,连接\(AP\)、\(BP\),求证:\(\angle APB-\angle OMB=90{}^\circ \).
\((3)\)如图\(3\),在\((2)\)的条件下,连接\(DP\)、\(MP\),延长\(MP\)交\(\odot O\)于点\(Q\),若\(MQ=6DP\),\(\sin \angle ABO=\dfrac{3}{5}\),直接写出\(\dfrac{MP}{MQ}\)的值.