Avariable triangle \( A B C \) is inscribed in a circle of diameter \( x \) units. If at a parti...

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Avariable triangle \( A B C \) is inscribed in a circle of diameter \( x \) units. If at a particular instant the rate of change of side ' \( a \) ' is \( x / 2 \) times the rate of change of the opposite angle \( A \), then \( \pi / A= \)
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