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differential equation

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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

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