Question 18. The diagram below shows a tree standing on the north bank of a river with straight parallel banks unning east to west. The angle of elevation of the top of a tree is 28° when measured from a point A on the south bank and distant 3 metres to the west of the tree. From another point B on the south bank and distant 5 metres to the east of the tree, the angle of elevation of the tree is 19°. (2+5 )(2-5 (a) Complete the diagram, showing all the given information. (b) Show that x2 - y² = 16. %3D

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