A tower AB leans towards west making an ...

A tower AB leans towards west making an angle `alpha` with vertical. The angular elevation of B, the top most point of the tower, is `60^(@)` as observed from a point C due east of A at a elevation of 10 ft from A. If the angular elevation of B from a point D due east of C at a distance of 20 ft from C is `45^(@)`, then the value of `2 tan alpha` is equal to

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