Differentiate w.r.t. y
-4y^{7}
Evaluate
-\frac{y^{8}}{2}
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8\left(-\frac{1}{2}\right)y^{8-1}
The derivative of ax^{n} is nax^{n-1}.
-4y^{8-1}
Multiply 8 times -\frac{1}{2}.
-4y^{7}
Subtract 1 from 8.
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