Evaluate
17ba^{2}
Differentiate w.r.t. b
17a^{2}
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7a^{2}\times 3b-4a^{2}b
Multiply a and a to get a^{2}.
21a^{2}b-4a^{2}b
Multiply 7 and 3 to get 21.
17a^{2}b
Combine 21a^{2}b and -4a^{2}b to get 17a^{2}b.
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