2.
在直角坐标系\(xOy\)中,直线\(l\)的参数方程为:\(\begin{cases} & x=1+\dfrac{4}{5}t, \\ & y=1+\dfrac{3}{5}t. \end{cases}(t\)为参数\()\),若以\(O\)为极点,\(x\)轴正半轴为极轴建立极坐标系,则曲线\(C\)的极坐标方程为\(\rho {{\sin }^{2}}\theta =2\sin (\dfrac{\pi }{2}-\theta )\),
\((1)\)写出曲线\(C\)的直角坐标方程,并指明\(C\)是什么曲线;
\((2)\)设直线\(l\)与曲线\(C\)相交于\(A\),\(B\)两点,求\(\left| AB \right|\)的值;
\((3)\)设点\(P(1,1)\),求\(\left| PA \right|\cdot \left| PB \right|\)的值.