Differentiate w.r.t. t
\frac{4t^{3}}{5}
Evaluate
\frac{t^{4}}{5}
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4\times \frac{1}{5}t^{4-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{4}{5}t^{4-1}
Multiply 4 times \frac{1}{5}.
\frac{4}{5}t^{3}
Subtract 1 from 4.
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