1.

A tower subtends angles alpha,2 alpha, 3 alpha respectively at points A,B and C all lying on a horizontal line through the foot of the tower, Then (AB)/(BC)=

Answer»

`(sin3alpha)/(sin2alpha)`
`1+2cos2alpha`
`2+2cos2alpha`
`(sin2alpha)/(SINALPHA)`

ANSWER :B


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