# Use trigonometric identities to find general solutions of the equations in Problems 44 through 46.44.y″+y′+y=sinxsin3x45.y″+9y=sin4x46.y″+y=xcos3x

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## Answered question

2021-11-16

Use trigonometric identities to find general solutions of the equations in Problems 44 through 46.

44.$y{}^{\u2033}+{y}^{\prime}+y=\mathrm{sin}x\mathrm{sin}3x$

45.$y{}^{\u2033}+9y={\mathrm{sin}}^{4}x$

46.$y{}^{\u2033}+y=x{\mathrm{cos}}^{3}x$