यदि \( a, b, c, d \) गुणोत्तर श्रेढ़ी में हैं, तो सिद्ध कीजिए कि- \[ \left(a^{2}+b^{2}+c^{2}\rig...

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यदि \( a, b, c, d \) गुणोत्तर श्रेढ़ी में हैं, तो सिद्ध कीजिए कि-
\[
\left(a^{2}+b^{2}+c^{2}\right)\left(b^{2}+c^{2}+d^{2}\right)=(a b+b c+c d)^{2}
\]
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