2.
\((1)\) 直线\(x=\dfrac{π}{2} \),\(x=\dfrac{3π}{2} \),\(y=0\)及曲线\(y=\cos x\)所围成图形的面积为______.
\((2)\)点\(P\)的柱坐标为\((\sqrt{2} ,\dfrac{π}{4} ,1)\),写出点\(P\)直角坐标______ .
\((3)\) 复数\(\dfrac{3+2i}{2-3i}- \dfrac{3-2i}{2+3i} = \)______ .
\((4)\) 在极坐标系中,已知\(A(2,\dfrac{π}{6} )\),\(B(4,\dfrac{π}{3} )\),则\(\triangle AOB\)的面积\(S= \)______ .