Differentiate w.r.t. x_c
63x_{c}^{6}
Evaluate
9x_{c}^{7}
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7\times 9x_{c}^{7-1}
The derivative of ax^{n} is nax^{n-1}.
63x_{c}^{7-1}
Multiply 7 times 9.
63x_{c}^{6}
Subtract 1 from 7.
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