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y = e² cosh x = e² [ e^x + e^-x ] = e^2x + e^0 = e^2x + 1

D = dy/dx = 2 e^2x

D² = d² y / dx² = d/ dx (dy/dx) = 4 e^2x

D³ = d³ y / dx³ = d/dx (d²y /dx) = 8 e^2x

D³-5D² +7 D - 3 = 8 e^2x - 5*4 e^2x + 7 * 2 e^2x - 3

D = dy/dx = 2 e^2x

D² = d² y / dx² = d/ dx (dy/dx) = 4 e^2x

D³ = d³ y / dx³ = d/dx (d²y /dx) = 8 e^2x

D³-5D² +7 D - 3 = 8 e^2x - 5*4 e^2x + 7 * 2 e^2x - 3