pavitorj6

2021-11-16

Use trigonometric identities to find general solutions of the equations in Problems 44 through 46.
44.$y{}^{″}+{y}^{\prime }+y=\mathrm{sin}x\mathrm{sin}3x$
45.$y{}^{″}+9y={\mathrm{sin}}^{4}x$
46.$y{}^{″}+y=x{\mathrm{cos}}^{3}x$

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