\(Rt\triangle ABC\)中,\(AC=BC\),\(∠ACB=90^{\circ}\),\(D\)为\(AB\)中点,\(∠EDF=90^{\circ}\),\(DE\)交\(AC\)于点\(E\),\(DF\)交\(BC\)于点\(F\),下列结论正确的是 ______ \(.(\)填写正确答案的序号\()\)
\((1)\)图形中全等的三角形有\(3\)对 \((2)\triangle ABC\)的面积等于四边形\(CEDF\)的面积的\(2\)倍
\((3)CE+CF= \sqrt {2}DA\) \((4)AE^{2}+BF^{2}=EF^{2}\).