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

.

Dear yogesh

nothing is clear from your question .

please post ur question with suitable brackets.

Please feel free to post as many doubts on our discussion forum as you can.
If you find any question Difficult to understand - post it here and we will get you
the answer and detailed solution very quickly.

 We are all IITians and here to help you in your IIT JEE preparation.

 All the best.
 
Regards,
Askiitians Experts
Badiuddin