5．
\((1)\)已知\(m= \int_{- \frac{π}{2}}^{ \frac{π}{2}}(\cos x−x+3\sin 2x)dx \)，则\({{\left( x-\dfrac{1}{2\sqrt{x}} \right)}^{3m}}\)的展开式中，常数项为_________
\((2)\int_{-1}^{1}{(\sqrt{1-{{x}^{2}}}}-1)dx=\)________．
\((3)\)设\(n\)为正整数，\(f\left( n \right)=1+\dfrac{1}{2}+\dfrac{1}{3}+\ldots +\dfrac{1}{n}\)，计算得\(f\left( 2 \right)=\dfrac{3}{2}\)，\(f\left( 4 \right) > 2\)，\(f\left( 8 \right) > \dfrac{5}{2}\)，\(f\left( 16 \right) > 3\)，观察上述结果，按照上面规律，可推测\(f\left( 4096 \right) > \)_____．
\((4)\)若复数\(z=(x+i)(1+i)\)是纯虚数，其中\(x\)为实数，\(i\)为虚数单位，则\(z\)的共轭复数\(\overline{z}=\)______．