7.
已知曲线\(C\)\({\,\!}_{1}\)的极坐标方程是\(ρ=1\),在以极点\(O\)为坐标原点,极轴为\(x\)轴的正半轴的平面直角坐标系中,将曲线\(C\)\({\,\!}_{1}\)所有点的横坐标伸长为原来的\(3\)倍,得到曲线\(C\)\({\,\!}_{2}\).
\((1)\)求曲线\(C\)\({\,\!}_{2}\)的参数方程;
\((2)\)直线\(l\)过点\(M(1,0)\),倾斜角为\( \dfrac{π}{4}\),与曲线\(C\)\({\,\!}_{2}\)交于\(A\),\(B\)两点,求\(|MA|·|MB|\)的值.