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Exercise 6.2 · Q20

Q.Obtain the differential equation by eliminating the arbitrary constants: y=e−2x(Acos⁡x+Bsin⁡x)y=e^{-2x}(A\cos x+B\sin x)

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y=e−2x(Acos⁡x+Bsin⁡x)y=e^{-2x}(A\cos x+B\sin x) has characteristic roots −2±i-2\pm i (real part −2-2, imaginary part 11), so the auxiliary equation is (m+2)2+1=0(m+2)^2+1=0, i.e. m2+4m+5=0m^2+4m+5=0. Hence yy solves $\dfrac{d^2y}{dx^2}+4\dfrac{dy}{dx}+5 …

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