Differentiate w.r.t. y
-\frac{21}{y^{4}}
Evaluate
\frac{7}{y^{3}}
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-3\times 7y^{-3-1}
The derivative of ax^{n} is nax^{n-1}.
-21y^{-3-1}
Multiply -3 times 7.
-21y^{-4}
Subtract 1 from -3.
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