在\(\Delta ABC\)中,内角\(A,B,C\)所对的边分别是\(a,b,c\) .
\((\)Ⅰ\()\)若\(c=2,C=\dfrac{\pi }{3}\),且\(\Delta ABC\)的面积\(S=\sqrt{3}\),求\(a,b\)的值;
\((\)Ⅱ\()\)若\(\sin C+\sin (B-A)=\sin 2A\),试判断\(\Delta ABC\)的形状.
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