fun-lim

Question: If $f(x+ay,\ x-ay)=axy$, then $f(x,\ y)$ is equal to

1) $xy$

2) ${{x}^{2}}-{{a}^{2}}{{y}^{2}}$

3) $\frac{{{x}^{2}}-{{y}^{2}}}{4}$

4) $\frac{{{x}^{2}}-{{y}^{2}}}{{{a}^{2}}}$

Solution:

Explanation: No Explanation

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