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Differentiate w.r.t. y
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3\times 25y^{3-1}-40y^{1-1}
The derivative of a polynomial is the sum of the derivatives of its terms. The derivative of a constant term is 0. The derivative of ax^{n} is nax^{n-1}.
75y^{3-1}-40y^{1-1}
Multiply 3 times 25.
75y^{2}-40y^{1-1}
Subtract 1 from 3.
75y^{2}-40y^{0}
Subtract 1 from 1.
75y^{2}-40
For any term t except 0, t^{0}=1.