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Find:y" + a2y = Cos ax

Answer»

y11 + a2y = cos ax

It's complementary equation is:

m2 + a2 = 0

⇒ m = \(\pm ac\) 

\(\therefore\) C. F. = C1 cos ax + C2 sin ax

P.I. = \(\frac{1}{D^2+a^2}cos\,ax=\frac{x}{2a}sin\,ax\) 

\(\therefore\) Complete solution of given differential equation is

y = C.F. + P.I.

 = C1 cos ax + C2 sin ax + x/2a sin ax



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