Evaluate
6a^{2}+9ab+5b^{2}
Differentiate w.r.t. a
12a+9b
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6a^{2}+9ab+4b^{2}+b^{2}
Combine a^{2} and 5a^{2} to get 6a^{2}.
6a^{2}+9ab+5b^{2}
Combine 4b^{2} and b^{2} to get 5b^{2}.
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