Differentiate w.r.t. y
74925y^{998}
Evaluate
75y^{999}
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999\times 75y^{999-1}
The derivative of ax^{n} is nax^{n-1}.
74925y^{999-1}
Multiply 999 times 75.
74925y^{998}
Subtract 1 from 999.
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