1.

The top of a pole, placed against a wall at an angle alpha with the horizon, just touches the coping, and when its foot is moved a m, away from the wall and its angle of inclination is beta, it rests on the sill of a window, the vertical distance of the sill from the coping is

Answer»

`a sin (( alpha + beta)//2)`
`a cos ((alpha + beta)//2)`
`a COT ((alpha + beta)//2)`
`a TAN ((alpha + beta)//2)`

Answer :C


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