The solution of $\frac{d^2y}{dx^2} = \cos x - \sin x$ is
- A$y = - \cos x + \sin x + c_1x + c_2$
- B$y = - \cos x - \sin x + c_1x + c_2$
- C$y = \cos x - \sin x + c_1x^2 + c_2x$
- D$y = \cos x + \sin x + c_1x^2 + c_2x$
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