Differentiate w.r.t. x
156x
Evaluate
78x^{2}
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2\times 78x^{2-1}
The derivative of ax^{n} is nax^{n-1}.
156x^{2-1}
Multiply 2 times 78.
156x^{1}
Subtract 1 from 2.
156x
For any term t, t^{1}=t.
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