Evaluate
\frac{3b}{a+2b}
Differentiate w.r.t. a
-\frac{3b}{\left(a+2b\right)^{2}}
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\frac{3ab}{\left(a+2b\right)a}
Divide \frac{3a}{a+2b} by \frac{a}{b} by multiplying \frac{3a}{a+2b} by the reciprocal of \frac{a}{b}.
\frac{3b}{a+2b}
Cancel out a in both numerator and denominator.
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