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```

Problem-

Find all functions f
from the reals to the reals such that

(
f (x)

f (x)
f (x)
+ f (z)) ( f (y) + f (t) ) = f (xy − zt) + f (xt +
yz)
for all real

x, y, z, t
.

```

6 years ago

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6 years ago

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