` int (x)/(1+x^(2) )dx ` का मान निकालें|

Explanation

मान लें की `1+ x^(2) =y` तो
`" "(dy)/(dx) =2x " "` या ` xdx =(dy)/(2)`
`therefore " "int (x)/(1+x^(2))dx =int (1)/(y) *(dy)/(2) int (1)/(y) dy `
` " "= (1)/(2) 1n y+ C=(1)/(2) 1n (1+ x^(2))+C`