1. a:b = c:d হলে, দেখাই যে,
(i) (a²+b²):(a²-b²) = (ac+bd): (ac-bd)​

1. a:b = c:d হলে, দেখাই যে,
(i) (a²+b²):(a²-b²) = (ac+bd): (ac-bd)​

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