1.

A tower leans towards west making an angle alpha with the vertical. The angular elevation of B, the top most point of the tower, is 75^(@) as observed from a point C due east of A at a distance of 20 units. If the angular elevation of B from a point due east of C at a distance of 20 units from C is 45^(@), then tan alpha is equal to

Answer»

`(sqrt3+1)/(2)`
`(sqrt3+1)/(sqrt3-1)`
`3-2sqrt3`
`(sqrt3-1)/(2)`

ANSWER :C


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