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The image of the point A (1,2) by the li...

The image of the point A (1,2) by the line mirror y=x is the point B and the image of B by the line mirror y=0 is the point `(alpha,beta)`, then a. `alpha=1,beta=-2` b. `alpha =,beta=0` c. `alpha=,beta=-1` d. none of these

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