write all allgebric identities of class 9
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(a+b)^square =(A square +b square +2ab)
(a-b)^square =(a square +b square -2ab)
a square -b square =(a -b)(a+b)
(a-b)^square =(a square +b square -2ab)
a square -b square =(a -b)(a+b)
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