A person standing at a point on ground c...

A person standing at a point on ground can see a point on a tower h meter above the ground. Whose angle of elevation is `2alpha`. If the person travels `sqrt7 h` meter away from towar then he can see a point on tower 2h meter above the ground whose angle of elevation is `alpha` , then the value of `tan alpha` is

`sqrt5-sqrt2`

`sqrt7-sqrt3`

`sqrt7-2`

`sqrt5`

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