Differentiate w.r.t. x_7
666
Evaluate
666x_{7}
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666x_{7}^{1-1}
The derivative of ax^{n} is nax^{n-1}.
666x_{7}^{0}
Subtract 1 from 1.
666\times 1
For any term t except 0, t^{0}=1.
666
For any term t, t\times 1=t and 1t=t.
666x_{7}
Multiply 1 and 666 to get 666.
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