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Class 10 Book Solution from Madhyamik Ganit Songi in Ratio and Proportion Question No: 3.2(37)(ii)

যদি a, b, c, d ক্রমিক সমানুপাতী হয়, তবে দেখাও যে \((a+d)(b+c)-(a+c)(b+d)=(b-c)^2\)

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