\((\)一\()\) 在直角坐标系\(xOy\)中,曲线\(C\)
\(1\)的参数方程为\(\begin{cases}x=a\cos t \\ y=1+a\sin t\end{cases} (t\)为参数,\(a > 0\)在以坐标原点为极点,\(x\)轴正半轴为极轴的极坐标系中,曲线\(C_{2}\):\(ρ=4\cos θ \).
\((1)\)说明\(C_{1}\)是哪一种曲线,并将\(C\)
\(1\)的方程化为极坐标方程;
\((2)\)直线\(C_{3}\)的极坐标方程为\(θ={a}_{0} \),其中\(a_{0}\)满足\(\tan a_{0}=2\),若曲线\(C_{1}\)与\(C_{2}\)的公共点都在\(C_{3}\)上,求\(a\).
\((\)二\()\)已知函数\(f\left(x\right)=\left|2x-a\right|+a \).
\((1)\)当\(a=2\)时,求不等式\(f\left(x\right)\leqslant 6 \)的解集;
\((2)\)设函数\(g\left(x\right)=\left|2x-1\right| \),当\(x∈R \)时,\(f\left(x\right)+g\left(x\right)\geqslant 3 \),求\(a\)的取值范围.