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The angle of elevation of the top of a building from the top and bottom of a tree are x and y respectively. If the height of the tree is h metre, then (in metre) the height of the building is1). $\frac{h cot x}{cot x + cot y}$2). $\frac{h cot y}{cot x + cot y}$3). $\frac{h cot x}{cotx - coty}$4). $\frac{h cot y}{cot x - cot y}$ |
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