已知函数\(f(x){=}2\cos^{2}x{+}2\sqrt{3}\sin x\cos x(x{∈}R){.}\).
\((\)Ⅰ\()\)当\(x{∈[}0{,}\dfrac{\pi}{2}{]}\)时,求函数\(f(x)\)的单调递增区间;
\((\)Ⅱ\()\)设\(∆ABC\)的内角\(A\),\(B\),\(C\)的对应边分别为\(a\),\(b\),\(c\),且\(c=3\),\(X(C)=2\),若向量\(\overrightarrow{m}=(1,\sin A)\)与向量\(\overrightarrow{n}=(2,\sin B)\)共线,求\(a\),\(b\)的值.