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