A:to cause
B:having been caused
C:caused
D:having caused
(Ⅰ)求角A、B、C的大小;
(Ⅱ)函数f(x)=sin(2x+A)+cos(2x﹣ C2 ),求函数f(x)单调递增区间,指出它相邻两对称轴间的距离.