1.

A flag staff of length 'd' stands on tower of height h. IF at a point on the ground the angle of elevation of the tower and top of the flag staff be alpha, beta then h=

Answer»

`(dcotbeta)/(Cotalpha-Cotbeta)`
`(dtanbeta)/(tanalpha-TANBETA)`
`d[(tanalpha-tanbeta)/(Cotalpha-Cotbeta)]`
`(dtanalpha)/(tanbeta)`

ANSWER :A


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