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Evaluate
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Differentiate w.r.t. b
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2a^{2}-3ab+1+4b^{2}+5ab-3b-2a^{2}
Add -6 and 7 to get 1.
2a^{2}+2ab+1+4b^{2}-3b-2a^{2}
Combine -3ab and 5ab to get 2ab.
2ab+1+4b^{2}-3b
Combine 2a^{2} and -2a^{2} to get 0.