Y^''+9y=0 it can be solved as sin3x+cos3x but in power series I coudnt convert the 3x for the sin
M Max64 New member Joined Apr 7, 2014 Messages 14 Apr 8, 2014 #1 [FONT="] [/FONT][FONT="]Y^''+9y=0 it can be solved as sin3x+cos3x but in power series I [/FONT]coudnt convert the 3x for the sin
[FONT="] [/FONT][FONT="]Y^''+9y=0 it can be solved as sin3x+cos3x but in power series I [/FONT]coudnt convert the 3x for the sin
H HallsofIvy Elite Member Joined Jan 27, 2012 Messages 7,763 Apr 8, 2014 #2 I don't know what we can say without knowing what you already have. What did you arrive at? Each term should have a "9" to a power. So that is "3" to what power? How does that power compare to the corresponding power of x? Last edited: Apr 8, 2014
I don't know what we can say without knowing what you already have. What did you arrive at? Each term should have a "9" to a power. So that is "3" to what power? How does that power compare to the corresponding power of x?
