A) \[\varphi \,\left( \frac{y}{x} \right)=kx\]
B) \[x\,\varphi \,\left( \frac{y}{x} \right)=k\]
C) \[\varphi \,\left( \frac{y}{x} \right)=ky\]
D) \[y\,\varphi \left( \frac{y}{x} \right)=k\]
Correct Answer: A
Solution :
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