3.
已知定义在\(R\)上的函数\(y=f\left( x \right)\)满足:函数\(y=f\left( x-1 \right)\)的图象关于直线\(x=1\)对称,且当\(x\in \left( -\infty ,0 \right),f\left( x \right)+xf{{{"}}}\left( x \right) < 0(f{{{"}}}\left( x \right)\)是函数\(f\left( x \right)\)的导函数\()\)成立\(.\)若\(a=\left( \sin \dfrac{1}{2} \right)\cdot f\left( \sin \dfrac{1}{2} \right)\),\(b=\left( {\ln }2 \right)\cdot f\left( {\ln }2 \right),c=\left( {lo}{{{g}}_{\frac{1}{2}}}\dfrac{1}{4} \right)\cdot f\left( {lo}{{{g}}_{\frac{1}{2}}}\dfrac{1}{4} \right)\),则\(a,b,c\)的大小关系是