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If 0 < y < x , which statement must be t...

If `0 < y < x` , which statement must be true?

A

1) `sqrtx-sqrty=sqrt(x-y)`

B

2) `xsqrty=ysqrtx`

C

3) `sqrtx+sqrtx=sqrt(2x)`

D

4) `sqrt(xy)=sqrtxsqrty`

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