Evaluate

4

Differentiate w.r.t. x

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4x^{1-1}

The derivative of ax^{n} is nax^{n-1}.

4x^{0}

Subtract 1 from 1.

4\times 1

For any term t except 0, t^{0}=1.

4

For any term t, t\times 1=t and 1t=t.

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