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Basic Engineering Mathematics Volume - II (For 3rd Semester ...

Here, we have (D2 +4) y = cos 2x Auxiliary equation is m2+ 4 = 0 ⇒ m = ± 2 i C.F. = A cos 2x + B sin 2x P.I. = D2 1 +4 cos 2x = x. 2 1 D cos 2x ...

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