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CBSE Class 12-science Answered

using properties f determinatns prove all following questions. (m+n)2                l2               mn (n + l)2               m2              ln                         = (l2 + m2 + n2) (l – m) (m -  n) (n – l) (l + m)2              n2               lm    b2 + c2         a2         a2 b2            c2 + a2       b2                      = 4a2b2c2 c2                 c2       a2 + b2
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