Evaluate
\frac{66}{13-x}
Differentiate w.r.t. x
\frac{66}{\left(13-x\right)^{2}}
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\frac{3\times 22}{13-x}
Express 3\times \frac{22}{13-x} as a single fraction.
\frac{66}{13-x}
Multiply 3 and 22 to get 66.
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