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A-
A
A+
Factorize:
a
2
+b
2
+2(ab+bc+ca)
Given,
a
2
+b
2
+2(ab+bc+ca)
= a
2
+b
2
+2ab+2bc+2ca
= (a+b)
2
+2c(a+b)
= (a+b)(a+b+c)
13