Evaluate
\frac{50\pi }{k}
Differentiate w.r.t. k
-\frac{50\pi }{k^{2}}
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\frac{1}{k}\times 50\pi
Divide 2\pi by 0.04 to get 50\pi .
\frac{50}{k}\pi
Express \frac{1}{k}\times 50 as a single fraction.
\frac{50\pi }{k}
Express \frac{50}{k}\pi as a single fraction.
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