如图,在长方体\(ABCD—{A}_{1}{B}_{1}{C}_{1}{D}_{1} \)中,\(AD=A{A}_{1}=1 \),\(AB=2 \),点\(E\)在棱\(AB\)上.
\((1)\)求异面直线\(D_{1}E\)与\(A_{1}D\)所成的角;
\((2)\)若平面\(D_{1}EC\)与平面\(ECD\)的夹角大小为\(45^{\circ}\),求点\(B\)到平面\(D_{1}EC\)的距离.
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