differential equation

[Syeda Zuriat Zahra]

can any one solve these equations by method of variation of parameters
y"+y=cosx
y"+y=cos²x
y"+y=coshx

[astarmathsandphysics]

Does it have to be by variation of parameters

[Syeda Zuriat Zahra]

yes

[astarmathsandphysics]

I will do it tonighton paper. These questions can be long and complicated with lots of stupid errors.

[astarmathsandphysics]

Sorry about the delay. Lot going on but I am doing a couple of pages as I write for my website

[astarmathsandphysics]

http://www.astarmathsandphysics.com/university_maths_notes/calculus/university_maths_notes_calculus_variation_of_parameters_method_solving_nonhomogeneous_differential_equations.html

http://www.astarmathsandphysics.com/university_maths_notes/calculus/university_maths_notes_calculus_variation_of_parameters_method_solving_nonhomogeneous_differential_equations_examples.html