Evaluate
\frac{b}{c}
Differentiate w.r.t. c
-\frac{b}{c^{2}}
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\frac{28ab^{2}\times 28a}{16a^{2}c\times 49b}
Divide \frac{28ab^{2}}{16a^{2}c} by \frac{49b}{28a} by multiplying \frac{28ab^{2}}{16a^{2}c} by the reciprocal of \frac{49b}{28a}.
\frac{b}{c}
Cancel out 4\times 4\times 7\times 7aab in both numerator and denominator.
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