Differentiate w.r.t. b
56b
Evaluate
28b^{2}
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2\times 28b^{2-1}
The derivative of ax^{n} is nax^{n-1}.
56b^{2-1}
Multiply 2 times 28.
56b^{1}
Subtract 1 from 2.
56b
For any term t, t^{1}=t.
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