Higher Secondary Question Paper Solution of Year 2019 Question No: A.3.(b)(i)

যদি \(ax^2 + by^2 = 1 \) এবং \(Ax^2 + By^2 = 1\) \((a \neq A, b \neq B, aB - bA \neq 0)\) বক্রদুটি পরস্পরকে লম্বভাবে ছেদ করে তবে দেখাও যে \({1 \over a}-{1 \over b} = {1 \over A}-{1 \over B}\)

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