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ABC is a vertical tower such that AB=BC=...

ABC is a vertical tower such that AB=BC=x from the foot A of the tower a horizontal line AQP is drawn.If the angle of elevation of the point B from P is `alpha` and that of C from Q is `2 alpha` then (AP)(PQ) is equal to
(A) `x^(2)sin2 alpha` (B) `x^(2)tan alpha` (C) `2x^(2)sin alpha` (D)`x^(2)`

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