झूले एवं वनस्पति के अवशेष किस गुफा से मिले
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Explanation:
(x+z)−y(y+z
=x 2+xz−y 2−yz
=x 2 −y 2 +xz−yz
=(x−y)(x+y)+z(x−y)
=(x−y)(x+y+z)
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