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Differentiate w.r.t. a
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\frac{5}{2}a-\frac{8}{4}a
Combine \frac{1}{2}a and 2a to get \frac{5}{2}a.
\frac{5}{2}a-2a
Divide 8 by 4 to get 2.
\frac{1}{2}a
Combine \frac{5}{2}a and -2a to get \frac{1}{2}a.
\frac{\mathrm{d}}{\mathrm{d}a}(\frac{5}{2}a-\frac{8}{4}a)
Combine \frac{1}{2}a and 2a to get \frac{5}{2}a.
\frac{\mathrm{d}}{\mathrm{d}a}(\frac{5}{2}a-2a)
Divide 8 by 4 to get 2.
\frac{\mathrm{d}}{\mathrm{d}a}(\frac{1}{2}a)
Combine \frac{5}{2}a and -2a to get \frac{1}{2}a.
\frac{1}{2}a^{1-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{1}{2}a^{0}
Subtract 1 from 1.
\frac{1}{2}\times 1
For any term t except 0, t^{0}=1.
\frac{1}{2}
For any term t, t\times 1=t and 1t=t.