Evaluate
-\frac{17mn}{4}
Differentiate w.r.t. m
-\frac{17n}{4}
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\frac{4\left(-5\right)mn}{4}+\frac{3mn}{4}
To add or subtract expressions, expand them to make their denominators the same. Multiply -5mn times \frac{4}{4}.
\frac{4\left(-5\right)mn+3mn}{4}
Since \frac{4\left(-5\right)mn}{4} and \frac{3mn}{4} have the same denominator, add them by adding their numerators.
\frac{-20mn+3mn}{4}
Do the multiplications in 4\left(-5\right)mn+3mn.
\frac{-17mn}{4}
Combine like terms in -20mn+3mn.
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