Differentiate w.r.t. L
\frac{19L^{3}}{3}
Evaluate
\frac{19L^{4}}{12}
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4\times \frac{19}{12}L^{4-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{19}{3}L^{4-1}
Multiply 4 times \frac{19}{12}.
\frac{19}{3}L^{3}
Subtract 1 from 4.
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Simultaneous equation
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Integration
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Limits
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