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Q.

Column - IColumn - II
a.x21x2+1x4+1dx=p.cot(x+α)a2+b2+c,α=tan1ba
b.dx(asinx+bcosx)2=q.sin1x+1x21x1+x+c
c.1+xcosxx1x2e2sinxdx=r.12sec1x2+12x+c
d.2x2(1+x)1x2dx=s.12logx2e2sinx1x2e2sinx+c

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a

A-r; B-p; C-s; D-q

b

A-p; B-q; C-r; D-s

c

A-s; B-r; C-p; D-q

answer is A.

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Detailed Solution

A)
 I=x21x2+1x4+1dx =11x2dxx+1xx2+1x2  put x+1x=t;  I=dttt22=12sec1t2+c=12sec1x2+12x+c

B)
  I=dx(asinx+bcosx)2= put a=rcosα,b=rsinα I=dxr2sinx+α2 =cot(x+α)a2+b2+c,α=tan1ba

C) I=1+xcosxx1xesinx2dx=(1+xcosx)esinxxesinx1xesinx2dx=1xesinx1xesinx2dxesinx=dtt1t2

Where t=xesinx

D)
 I=2x2(1+x)1-x2dx=1x2+1(1+x)1x2dx =1-x1-x2dx+1(1+x)1x2dx =11-x2dx-x1-x2dx+I1 =sin-1x+1-x2+I1
 

now put 1+x=1t,dx=-1t2dx and x=1tt in I1

we get
I1=11t11tt2x1t2dt =-dt2t-1 =-2t-1
I=sin1x+1x21x1+x+c

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