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Evaluate
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Differentiate w.r.t. x
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1-\frac{2s}{x+1}
Express \frac{2}{x+1}s as a single fraction.
\frac{x+1}{x+1}-\frac{2s}{x+1}
To add or subtract expressions, expand them to make their denominators the same. Multiply 1 times \frac{x+1}{x+1}.
\frac{x+1-2s}{x+1}
Since \frac{x+1}{x+1} and \frac{2s}{x+1} have the same denominator, subtract them by subtracting their numerators.