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

.

yogesh sahdev , 15 Years ago

Grade 11