Evaluate

Let us put  then we have

So the integral becomes

u can even use euler's substitution

put (x^2+1)^1/2=t +x ............then squarin u get .....

x^2+1=t^2+2tx+x^2 ...............

frm this u egt x =(1-t^2)/2t

substitute and solve u'lll surely get d asnwer .....

if nt .............do ask ................