Trigonometry

. A tower on one side of a river is directly east and north of points A and B, respectively, on the other side of the river.The top of the tower has angles of elevation and from Aand B, respectively, as in the picture on the right. Let d be the distance between A and B. Assuming that both sides of the river are at the same elevation, show that the height h of the tower is

h = d/p(cot )2 + (co............

This question may be found in the trigonometry online book mecmath.net/trig/trigbook.pdf

the question is on page 20 number 5. There was no way I could use my desktop to type the equation.

Thanks,

Yvonne