1.

यदि ` x^(y) =e^(x-y)` तब सिद्ध कीजिए की `(dy)/(dx) = (log x )/((1+log x )^(2))`

Answer» ` " "x^(y) =e^(x-y)`
दोनों पक्षों का लघुगणक लेने पर,
` " "ylog x =(x-y) log_e e= x -y`
` rArr " "y(1+log x )=x `
` rArr " "y= (x)/((1+log x ))`
` therefore (dy)/(dx) ((1+log x )(d)/(dx) x-x (d)/(dx) (1+ log x ))/((1+ log x )^(2))=(1+log x-1)/((1+log x )^(2))`
` rArr" "(dy)/(dx) =(log x )/((1+ log x )^2)`


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