Two train lines intersect each other at a junction at an acute angle theta. A train is passing along one of the two lines. When the front of the train is at the junction, the train subtends an angle alpha at a station on the other line. It subtends an angle beta(

Question

Two train lines intersect each other at a junction at an acute angle theta. A train is passing along one of the two lines. When the front of the train is at the junction, the train subtends an angle alpha at a station on the other line. It subtends an angle beta(<alpha) at the same station, when its rear is at the junction. find tan theta as a function of only alpha and beta.

anonymous · Answer

@experimentX , I think it is not that way.  According to me|dw:1336125300035:dw|

Train's initial position at AB,  Train's final position at BC.  Now I don't understand what will subtend imply diagramatically here??