Evaluate
84ba^{2}
Differentiate w.r.t. b
84a^{2}
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4a^{2}\times 3\times 7b
Multiply a and a to get a^{2}.
12a^{2}\times 7b
Multiply 4 and 3 to get 12.
84a^{2}b
Multiply 12 and 7 to get 84.
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