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