Derivation ratlo haan, step-by-step, samjho ki exam wale ne kahan se kaatne ke liye mark rakhe hain. Mein toh bas final formula ratt leti thi, aur exam mein half-board bhar ke phans gayi. Mera radio bhi purana hai, lekin uska knobs ghumana aata hai, kaam karta hai — derivation bhi waisa hi hai, bus thoda ghumana seekhna padega re.
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