Differentiate w.r.t. t_31
1
Evaluate
t_{31}-40
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\frac{\mathrm{d}}{\mathrm{d}t_{31}}(t_{31}-40)
Multiply 8 and 5 to get 40.
t_{31}^{1-1}
The derivative of a polynomial is the sum of the derivatives of its terms. The derivative of a constant term is 0. The derivative of ax^{n} is nax^{n-1}.
t_{31}^{0}
Subtract 1 from 1.
1
For any term t except 0, t^{0}=1.
t_{31}-40
Multiply 8 and 5 to get 40.
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