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Differentiate w.r.t. y
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\frac{y}{y\left(-y+2\right)}+\frac{-y+2}{y\left(-y+2\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 2-y and y is y\left(-y+2\right). Multiply \frac{1}{2-y} times \frac{y}{y}. Multiply \frac{1}{y} times \frac{-y+2}{-y+2}.
\frac{y-y+2}{y\left(-y+2\right)}
Since \frac{y}{y\left(-y+2\right)} and \frac{-y+2}{y\left(-y+2\right)} have the same denominator, add them by adding their numerators.
\frac{2}{y\left(-y+2\right)}
Combine like terms in y-y+2.
\frac{2}{-y^{2}+2y}
Expand y\left(-y+2\right).