- #1
cragar
- 2,552
- 3
Homework Statement
1/((x^2-1)^2)
Homework Equations
The Attempt at a Solution
so i get (Ax+B)/(x^2-1) + (Cx+D)/((x^2-1)^2)
then i multiply both sides by ((x^2-1)^2)
then i get 1=(Ax+B)(x^2-1)+ (Cx+D)
then i multiply it out Ax^3+Bx^2 -Ax +Cx +D =1
then i equate the coeffcients
A=0 B=0 -A+C=0 -B+D=1 D=1
but when i plug these back in i don't get what my book gets and i setting this up correctly