6.
\((1)\)复数\(z={\cos }75{}^\circ +i{\sin }75{}^\circ (i\)是虚数单位\()\),则在复平面内\({{z}^{2}}\)对应的点位于第__________象限.
\((2)\)已知\(f\left( x \right)={\ln }x,0 < a < b\),若\(p=f\left( \sqrt{ab} \right),q=f\left( \dfrac{a+b}{2} \right),r=\dfrac{f\left( a \right)+f\left( b \right)}{2}\),则\(p,q,r\)的大小关系是______.
\((3)\)某天,小赵、小张、小李、小刘四人一起到电影院看电影,他们到达电影院之后发现,当天正在放映\(A\),\(B\),\(C\),\(D\),\(E\)五部影片,于是他们商量一起看其中的一部影片:
小赵说:只要不是\(B\)就行\(;\) 小张说:\(B\),\(C\),\(D\),\(E\)都行\(;\)
小李说:我喜欢\(D\),但是只要不是\(C\)就行\(;\) 小刘说:除了\(E\)之外,其他的都可以.
据此判断,他们四人可以共同看的影片为______________.
\((4)\)设\(\triangle ABC\)的面积为\(1\).
如图\(1\),分别将\(AC\),\(BC\)边\(2\)等分,\(D_{1}\),\(E_{1}\)是其分点,连接\(AE_{1}\),\(BD_{1}\)交于点\(F_{1}\),得到四边形\(CD_{1}F_{1}E_{1}\),其面积\(S_{1}=\dfrac{1}{3}\).
如图\(2\),分别将\(AC\),\(BC\)边\(3\)等分,\(D_{1}\),\(D_{2}\),\(E_{1}\),\(E_{2}\)是其分点,连接\(AE_{2}\),\(BD_{2}\)交于点\(F_{2}\),得到四边形\(CD_{2}F_{2}E_{2}\),其面积\(S_{2}=\dfrac{1}{6}\);
如图\(3\),分别将\(AC\),\(BC\)边\(4\)等分,\(D_{1}\),\(D_{2}\),\(D_{3}\),\(E_{1}\),\(E_{2}\),\(E_{3}\)是其分点,连接\(AE_{3}\),\(BD_{3}\)交于点\(F_{3}\),得到四边形\(CD_{3}F_{3}E_{3}\),其面积\(S_{3}=\dfrac{1}{10}\);\(……\)
按照这个规律进行下去,若分别将\(AC\),\(BC\)边\((n+1)\)等分,\(…\),得到四边形\(CD_{n}E_{n}F_{n}\),其面积\(S_{n}=\)__________.