- #1
BarackObama
- 13
- 0
Homework Statement
4y'' + y = cosx
Solve using variation of parameters
Homework Equations
The Attempt at a Solution
from a) -> yc(x) = c1cos(x/2) + c2sin(x/2)
let y1 = cos(x/2) , y2 = sin(x/2)
y1y2' - y2y1' = 1/2cosx/2 + 1/2sinx/2 = 1/2
u1' = ?
How do I find this?