solution of the differential equation (D2+a2)=cosax ,is
Hey,
f D is the particular integral of f(D) y = X. 2. 1. X. X dx. D. = ∫ . 3. 1 ax ax. X e. X e dx. D a ... Then to find PI put D – 2 for D in f(D) and take out e–2x. ∴. PI = { }. 2 ... ax f D f D. Put D2 = – a2.