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x2-1-y (y+2) এর উৎপাদক কত?
( x - y - 1 ) ( x - y + 1)
(x - y + 1) (x + y + 1)
( x + y + 1) (x - y - 1)
(x - y)(x + y + 1)
.
√169 is equal to----