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Good question....it's a simple difference of total time derivative and partial time derivative......here no direct dependency of A on t is given. That's why we put it zero. But it doesn't mean that it's total time derivative is also zero. Please go through the total time derivative and partial time derivative concept once. You will understand it easily I hope you get some idea.... please let us know you get it or not

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Thanks....Keep watching❤

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Thanks for commenting.....There is a direct formula for this but the purpose of this video is not giving only solution but the concept behind that.....

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