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A point A is directly below a window. Another point B is 15 m from A at the same horizontal level. From B the angle of elevation of the bottom of the window is 300 and the angle of elevation of the top of the window
is 350. Calculate the vertical distance
(a) From A to the top of the window
(b) From A to the bottom of the window
(c) From the bottom to the top of the window