An observer finds that the angular elevation of a tower is A. On advancing 3 m towards the tower the elevation is  45

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Q 3070834716.     An observer finds that the angular elevation of a tower is A. On advancing 3 m towards the tower the elevation is  45 ^{ \circ } and on advancing 2  m nearer, the elevation is ( 90 ^{ \circ }-A). The height of the tower is
A

2 m

B

4 m

C

6 m

D

8 m`

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