If \( x=a(\theta-\sin \theta) \) and \( y=a(1-\cos \theta) \), find \( \frac{d^{2} y}{d x^{2}} \...
If \( x=a(\theta-\sin \theta) \) and \( y=a(1-\cos \theta) \), find \( \frac{d^{2} y}{d x^{2}} \) at \( \theta=\pi \).
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