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Evaluate
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Differentiate w.r.t. y
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-4y^{3}-9y^{3}
Combine -5y^{3} and y^{3} to get -4y^{3}.
-13y^{3}
Combine -4y^{3} and -9y^{3} to get -13y^{3}.
\frac{\mathrm{d}}{\mathrm{d}y}(-4y^{3}-9y^{3})
Combine -5y^{3} and y^{3} to get -4y^{3}.
\frac{\mathrm{d}}{\mathrm{d}y}(-13y^{3})
Combine -4y^{3} and -9y^{3} to get -13y^{3}.
3\left(-13\right)y^{3-1}
The derivative of ax^{n} is nax^{n-1}.
-39y^{3-1}
Multiply 3 times -13.
-39y^{2}
Subtract 1 from 3.