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The solution of the equation $$y'' + y = 0$$ satisfy the condition $$y(0) = 1, y\left(\frac{\pi}{2}\right) = 2$$, is
$$\cos x + 2 \sin x$$
$$\cos x + \sin x$$
$$2 \cos x + \sin x$$
$$2(\cos x + 2 \sin x)$$
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