A flag staff of length 'd' stands on tow...

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=

`(dcotbeta)/(Cotalpha-Cotbeta)`

`(dtanbeta)/(tanalpha-tanbeta)`

`d[(tanalpha-tanbeta)/(Cotalpha-Cotbeta)]`

`(dtanalpha)/(tanbeta)`

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