The value of 1/(1-y) + 1/(1+y) + 2/(1+y^2) + 4/(1+y^4)  Choose the correct answer.
A) 8/(1-y^8)  B) 4x/(1+y^2)  C) 4/(1-y^6)  D) 4/(1+y^4)  E) 4x/(1-y^4)
Highlighted part has mistake as the exponent of y must be 4 in last term   CORRECT QUESTION ISThe value of 1/(1-y) + 1/(1+y) + 2/(1+y^2) + 4/(1+y^4) = ?   Solution is as mentioned below...   one more way that could get the answer in the type of eqn and choices given is to substitute some value for y...   0 would be better as the eq has constant term free of term 'y'..   the Eq gives us 8 as the ans , as also only choice 8/(1-y^8)..
<result>A</result>
The value of 1/(1-y) + 1/(1+y) + 2/(1+y^2) + 4/(1+y^4)