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For y = A sin x + B cos x, which expression equals zero?
Ad2y/dx2 + 2y
Bd2y/dx2 + dy/dx
Cd2y/dx2 - y
Dd2y/dx2 + y
Answer & Solution
Correct answer: D. d2y/dx2 + y
Differentiating twice gives -A sin x - B cos x, which is exactly -y.
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