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If the angles of elevation of the top of a tower from two points at distances a and b from the base and in the same straight line with it are complementary then the height of the tower is

A

`(a+b)/(a-b)`

B

`(a-b)/(a+b)`

C

`((a-b)b)/(a+b)`

D

`(a-b)/((a+b)b)`

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