Factorise 4 /9a2 +b2 +4 /3 ab
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(2/3a)^2+2×2/3a×b+b^2
=(2/3a+b)^2
=(2/3a+b)(2/3a+b)
=(2/3a+b)^2
=(2/3a+b)(2/3a+b)
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