如图\(1\),已知抛物线\(C_{1}\):\(y=ax^{2}+bx+c\)与\(x\)轴交于\(A(- \dfrac {16}{3},0)\),\(B(6,0)\)两点,与\(y\)轴正半轴交于点\(C\),且\(\tan ∠ABC= \dfrac {4}{3}\).
\((1)\)求该抛物线\(C_{1}\)的解析式;
\((2)\)如图\(1\),点\(P\)是\(x\)轴上方的抛物线上的一动点,连接\(PB\),\(PC\),设所得\(\triangle PBC\)的面积为\(S.\)若\(\triangle PBC\)的面积\(S\)为整数,则这样的\(\triangle PBC\)共有多少个?请说明理由.
\((3)\)如图\(2\),将原抛物线\(C_{1}\)绕着某点旋转\(180^{\circ}\),得到的新抛物线\(C_{2}\)的顶点为坐标原点,点\(F(0,1)\),点\(Q\)是\(y\)轴负半轴上一点,过\(Q\)点的直线\(PQ\)与抛物线\(C_{2}\)在第二象限有唯一公共点\(P\),过\(P\)分别作\(PG⊥PQ\)交\(y\)轴与\(G\),\(PT/\!/y\)轴,求证:\(∠TPG=∠FPG\).