Question:
Mark $(\sqrt{)}$ against the correct answer in the following:
If $y=e^{x}+e^{x+\ldots \infty}$ then $\frac{d y}{d x}=?$
A. $\frac{1}{(1-y)}$
B. $\frac{y}{(1-y)}$
C. $\frac{y}{(y-1)}$
D. none of these
Solution:
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