The top of a hill observed from the top ...

The top of a hill observed from the top and bottom of a building of height `h` is at angles of elevation `p` and `q` respectively. The height of the hill is

`(h cot q)/(cot q - cot p)`

`(h cot p)/(cot p-cot q)`

`(h tan p)/( tan p - tan q)`

none of these

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