Question
$\frac{{{d^2}y}}{{d{x^2}}} = \cos x - \sin x$ का हल है
दोनों तरफ समाकलन करने पर, $\frac{{dy}}{{dx}} = \sin x + \cos x + {c_1}$
पुन: $y = - \cos x + \sin x + {c_1}x + {c_2}$.
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