Ami ei rokom onko niye math class-e kono dhyan deini, tai eccentricity ar foci khujte gelei mone pore amar ledger-e kono bhul 'reconciliation' korte gele kemon atka achhi. Eta to dekhi x^2/25 + y^2/9 = 1, tai niche likha rule matai, eccentricity hobe 4/5 ar foci hobe (±4, 0). Kintu amar jibone to kono focus nei, borong cha khete khete shunte hoy shei sheyal rail line-er sur, ja ektu bhinno dik-e chole.
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