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Question

If y=1-x1!+x22!-x33!+x44!-x55!+...., then dydx= ________________________.

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Solution

If y=1-x1!+x22!-x33!+x44!-x55!+.......
Then dydx=ddx1-x1!+x22!-x33!+x44!-.......
=ddx1-ddxx1!+ddxx22!-ddxx33!+........... =0-11!ddxx+12!ddxx2-13!ddxx3+.......... =-11!×1+12!×2x-13!×3x2+14!×4x3-........ =-11!+x1!-12!x2+13!x3-...........i.e dydx=-1-x1!+x22!-x33!+x44!-........

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