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Evaluate
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Differentiate w.r.t. y
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\frac{25y}{2x}\times \frac{4x}{5y^{2}}
Cancel out y in both numerator and denominator.
\frac{25y\times 4x}{2x\times 5y^{2}}
Multiply \frac{25y}{2x} times \frac{4x}{5y^{2}} by multiplying numerator times numerator and denominator times denominator.
\frac{2\times 5}{y}
Cancel out 2\times 5xy in both numerator and denominator.
\frac{10}{y}
Multiply 2 and 5 to get 10.
\frac{\mathrm{d}}{\mathrm{d}y}(\frac{25y}{2x}\times \frac{4x}{5y^{2}})
Cancel out y in both numerator and denominator.
\frac{\mathrm{d}}{\mathrm{d}y}(\frac{25y\times 4x}{2x\times 5y^{2}})
Multiply \frac{25y}{2x} times \frac{4x}{5y^{2}} by multiplying numerator times numerator and denominator times denominator.
\frac{\mathrm{d}}{\mathrm{d}y}(\frac{2\times 5}{y})
Cancel out 2\times 5xy in both numerator and denominator.
\frac{\mathrm{d}}{\mathrm{d}y}(\frac{10}{y})
Multiply 2 and 5 to get 10.
-10y^{-1-1}
The derivative of ax^{n} is nax^{n-1}.
-10y^{-2}
Subtract 1 from -1.