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यदि ` y = x/( x+5)` , तो का मान ज्ञात कीजिए कि ` x dy/dx= y(1-y)` |
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Answer» दिया है ` y = x/(x +5 )` ` (dy)/(dx) = (( x+5) .d/(dx) (x)-x.d/(dx)( x +5))/(( x +5)^(2)) = ((x+5).1-x.1)/((x+5)^(2))` ` = ( x+5-x)/(x+5)^(2) = 5/(x+5)^(2) rArr x (dy)/(dx) = (5x)/(x+5)^(2) " "`…(1) तथा ` y ( 1-y) = x/( x +5) (1- x/(x+5)) = x/(x+5) (5/(x+5)) = (5x)/( x+5)^(2)" "`...(2) अतः (1 ) और (2 ) से , ` x (dy)/(dx) = y( 1-y)`. |
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