सिद्ध कीजिए कि वक्र \( y=7 x^{3}+11 \) के उन बिंदुओं पर स्पर्श रेखाएँ समांतर है जहाँ \( x=2 \) त...

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सिद्ध कीजिए कि वक्र \( y=7 x^{3}+11 \) के उन बिंदुओं पर स्पर्श रेखाएँ समांतर है जहाँ \( x=2 \) तथा \( x=-2 \) है।
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