1.

ABCD is a rectangular park with AB = a. A tower standing at C makes angles alpha and beta at A and B respectively, the height of the tower is

Answer»

`(a)/(SQRT(cot^(2)ALPHA+cot^(2)beta))`
`(a)/(sqrt(cot^(2)alpha-cot^(2)beta))`
`(a tan alpha tan beta)/(sqrt(tan^(2)beta + tan^(2)alpha))`
`(a cot alpha cot beta)/(sqrt(cot^(2) alpha - cot^(2) beta))`

ANSWER :B


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