(3a-1/3b)²+(b+2a)(b-2a)

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(3a-1/3b)²+(b+2a)(b-2a)(3a-1/3b)²+(b+2a)(b-2a)(3a-1/3b)²+(b+2a)(b-2a)(3a-1/3b)²+

(3a-1/3b)²+(b+2a)(b-2a)
(3a-1/3b)²+(b+2a)(b-2a)

(3a-1/3b)²+(b+2a)(b-2a)
(3a-1/3b)²+(b+2a)(b-2a),
=9a²-2ab+1/9b²+b²-4a²
=5a²-2ab+10/9b²