1.

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)=

Answer»

`b//a`
`a//b`
`2//ab`
`2a//b`

ANSWER :A


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