9.
\((1)\)命题“\(\forall x\in R,\sin x\leqslant 1\) ”的否定是 .
\((2)\)在\(\triangle ABC\)中,若\(跱B~稖�(�渺(��=跱B~稖��癦�\),则\(\triangle ABC\)的形状是 .
\((3)\)已知曲线\(C_{1}\)的参数方程是\(\begin{cases} & x=\sqrt{t} \\ & y=\dfrac{\sqrt{3t}}{3} \\ \end{cases}\) \((t\)为参数\().\)以坐标原点为极点,\(x\)轴的正半轴为极轴建立极坐标系,曲线\(C_{2}\)的极坐标方程是\(ρ=2.\)则\(C_{1}\)与\(C_{2}\)交点的直角坐标为 .
\((4)\)对于任意\(a\in [-1,1]\),函数\(f(x)={{x}^{2}}+(a-4)x+4-2a\)的值恒大于零,那么\(x\)的取值范围是 .