Evaluate
a^{2}+85b^{2}
Differentiate w.r.t. a
2a
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a^{2}+b^{2}+84b^{2}
Multiply 2 and 42 to get 84.
a^{2}+85b^{2}
Combine b^{2} and 84b^{2} to get 85b^{2}.
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