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Evaluate
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Differentiate w.r.t. y
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9\times 1y^{-3}
Calculate x to the power of 0 and get 1.
9y^{-3}
Multiply 9 and 1 to get 9.
\frac{\mathrm{d}}{\mathrm{d}y}(9\times 1y^{-3})
Calculate x to the power of 0 and get 1.
\frac{\mathrm{d}}{\mathrm{d}y}(9y^{-3})
Multiply 9 and 1 to get 9.
-3\times 9y^{-3-1}
The derivative of ax^{n} is nax^{n-1}.
-27y^{-3-1}
Multiply -3 times 9.
-27y^{-4}
Subtract 1 from -3.