Evaluate
\frac{220}{80-f_{32}}
Differentiate w.r.t. f_32
\frac{220}{\left(80-f_{32}\right)^{2}}
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\frac{11}{2\left(2-\frac{1}{40}f_{32}\right)}
Express \frac{\frac{11}{2}}{2-\frac{1}{40}f_{32}} as a single fraction.
\frac{11}{4+2\left(-\frac{1}{40}\right)f_{32}}
Use the distributive property to multiply 2 by 2-\frac{1}{40}f_{32}.
\frac{11}{4+\frac{2\left(-1\right)}{40}f_{32}}
Express 2\left(-\frac{1}{40}\right) as a single fraction.
\frac{11}{4+\frac{-2}{40}f_{32}}
Multiply 2 and -1 to get -2.
\frac{11}{4-\frac{1}{20}f_{32}}
Reduce the fraction \frac{-2}{40} to lowest terms by extracting and canceling out 2.
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