Answers!
1.(D^(4)+2a^(2)D^(2)+a^(4))y=8 cos ax
2.(d^(2))/(dx^(2))+(3dy)/(dx)+2y=sin2x
3.(d^(2)y)/(dx^(2))+y=sin3xcos2x
I need solution above those math
Comment
Answer the question...
1.(D^(4)+2a^(2)D^(2)+a^(4))y=8 cos ax
2.(d^(2))/(dx^(2))+(3dy)/(dx)+2y=sin2x
3.(d^(2)y)/(dx^(2))+y=sin3xcos2x
I need solution above those math
Comment