Differentiate w.r.t. b
90b
Evaluate
45b^{2}
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2\times 45b^{2-1}
The derivative of ax^{n} is nax^{n-1}.
90b^{2-1}
Multiply 2 times 45.
90b^{1}
Subtract 1 from 2.
90b
For any term t, t^{1}=t.
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