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A ladder rests against wall at an angle ...

A ladder rests against wall at an angle `alpha` to the harizontal. Its foot is pulled away from the wall through a distance 'a' so that it slides a distance 'b' down the wall making an angle `beta` with the horzontal, then `tan((alpha+beta)/2)`=

A

`b//a`

B

`a//b`

C

`2//ab`

D

`2a//b`

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The correct Answer is:
A
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