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Evaluate
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Differentiate w.r.t. y
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\frac{7\times 2}{2y}
Multiply \frac{7}{2} times \frac{2}{y} by multiplying numerator times numerator and denominator times denominator.
\frac{7}{y}
Cancel out 2 in both numerator and denominator.
\frac{\mathrm{d}}{\mathrm{d}y}(\frac{7\times 2}{2y})
Multiply \frac{7}{2} times \frac{2}{y} by multiplying numerator times numerator and denominator times denominator.
\frac{\mathrm{d}}{\mathrm{d}y}(\frac{7}{y})
Cancel out 2 in both numerator and denominator.
-7y^{-1-1}
The derivative of ax^{n} is nax^{n-1}.
-7y^{-2}
Subtract 1 from -1.