JAMB - Mathematics (1989 - No. 32)
The pilot of an aeroplane, flying 10km above the ground in the direction of a landmark, views the landmark to have angles of depression of 35o and 55o. Find the distance between the two points of observation
10(sin 35o - sin 55o)
10 cos35o - cos 55o
10(tan35o - tan55o)
10(cot35o - cot55o)
Vysvětlení
x = 10 cot35o - 10 cot55o
= 10(cot35o - cot55o)
= 10(cot35o - cot55o)