– Can you tell me ____ to London? – Sure. Next month.
A:when you will travel
B:when will you travel
C:when you travelled
D:when did you travel
cos(x﹣π4)﹣cos(x+π4)的值域是____
如图,AB∥CD,CE平分∠BCD,∠DCE=18°,则∠B等于( )