Evaluate
3a^{2}+\frac{4b}{5}+0.21
Differentiate w.r.t. a
6a
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3a^{2}-4.2b+5b+0.21
Combine 1.8a^{2} and 1.2a^{2} to get 3a^{2}.
3a^{2}+0.8b+0.21
Combine -4.2b and 5b to get 0.8b.
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