the angle of elevation of the top of tower from a point p on the ground is (alpha). After walking a distance of d towards the foot of the tower the angle if elevation of the top of tower is found to be (bita) then ____ holds good
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tanβ= xh
tanα= d+xh
∴x= tanβh
∴tanα= d+ tanβhh
∴dtanα+ tanβ
h.tanα =h
∴h= 1− tanβtanα
dtanα= tanβ−tanα.
dtan.tanβ
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