Evaluate
14a^{2}-15b^{2}+3
Differentiate w.r.t. a
28a
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14a^{2}-14b^{2}-b^{2}+3
Combine 13a^{2} and a^{2} to get 14a^{2}.
14a^{2}-15b^{2}+3
Combine -14b^{2} and -b^{2} to get -15b^{2}.
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