Differentiate w.r.t. y
2y^{3}
Evaluate
\frac{y^{4}}{2}
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4\times \frac{1}{2}y^{4-1}
The derivative of ax^{n} is nax^{n-1}.
2y^{4-1}
Multiply 4 times \frac{1}{2}.
2y^{3}
Subtract 1 from 4.
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