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(5) यदि परवलय \( y^{2}=4 a x \) की किसी नाभीय जीवा के खण्डों की लम्बाइयाँ \( l_{1} \) तथा \( l_{2} \) हैं तो सिद्ध कीजिए कि \[ \frac{1}{l_{1}}+\frac{1}{l_{2}}=\frac{1}{a} \]

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