\frac { 1 } { 4 } \text { af } 80 =
Evaluate
20af
Differentiate w.r.t. a
20f
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\frac{80}{4}af
Multiply \frac{1}{4} and 80 to get \frac{80}{4}.
20af
Divide 80 by 4 to get 20.
Examples
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