y = a cos x + b sin x ಎಂಬುದು _________ ಪರಿಹಾರವಾಗಿರುವ ಒಂದು ವಿಭಿನ್ನ ಸಮೀಕರಣ.

1
\(​\rm\frac{d^2y}{dx^2}\) + y = 0
2
\(​\rm\frac{d^2y}{dx^2}\) − y = 0
3
\(​\rm\frac{d^2y}{dx^2}\) + (a + b) y = 0
4
\(​\rm\frac{d^2y}{dx^2}\) + (a − b) y = 0

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