Derivative ka matlab maine aaj hi seekha hai: kisi bhi point par slope. Root x ka first principle se nikalna hai toh limit laga ke thoda sa algebra karna padega.
Pura formula likhte waqt mere papa ki dukaan ka hisaab yaad aaya — jaise ek rupaye ka aana-jaana, waise hi slope bhi chhoti badi change ko measure karta hai.
Mera chhota beta bhi pencil le ke mere saath baitha hai, pooch raha hai, "Papa, yeh sab kya likh rahe ho?" Main soch raha hoon, isko jab padhaunga na, yeh sab kitni aasani se samajh jaayega.
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