I forgot how to take these derivatives. Could someone tell me the rule/work it out.(adsbygoogle = window.adsbygoogle || []).push({});

P = (doS1 + d1So) / (d1 + S1)

dP/dS1 = ?

I think it should be (denominator*d(numerator) - d(denom.)num.) / denom^2

but that gets the wrong answer.

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# Derivative question

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