If f(2x + y/8 , 2x - y/8) = xy, then f(m...

If `f(2x + y/8 , 2x - y/8) = xy`, then `f(m,n)+f(n,m)=0`

A

only when `m=n`

B

only when `m != n`

C

only when `m = -n`

D

for all m and n

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The correct Answer is:

D

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