Question:medium

The particular integral of the differential equation \[ (D^2+1)y = \sin x\,\sin2x \] is

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Remember the identity \[ \boxed{ \sin A\sin B = \frac12[\cos(A-B)-\cos(A+B)]. } \] Use it before finding the particular integral.
Updated On: Jul 14, 2026
  • \(\dfrac{x}{4}\sin x+\dfrac{1}{16}\cos3x\)
  • \(\dfrac{x}{2}\sin x+\dfrac{1}{8}\cos3x\)
  • \(\dfrac{x}{4}\cos x+\dfrac{1}{16}\sin3x\)
  • \(\dfrac{x}{2}\cos x-\dfrac{1}{8}\cos3x\)
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The Correct Option is A

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