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For y = cos x, y'' + y =

A0 (y'' = -cos x; y'' + y = 0)
B-1
C1
D2cos x
Answer & Solution
Correct answer: A. 0 (y'' = -cos x; y'' + y = 0)
y = cos x. y'' = -cos x. y'' + y = -cos x + cos x = 0. SHM differential equation.
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