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Q.

I=dxa+bcosx, where a, b> 0 and a+b=u, a-b=v

 Column - I Column - II
A)v = 0P)1ulogu+tanx/2utanx/2+c
B)v >0Q)2uvtan1(tanx/2v/u)+c
C)v < 0R)1uvlogu+vtanx/2uvtanx/2+c
D)v = -1S)2utanx/2+c
 ABCD
1.SQRP
2.QSRP
3.SRPP
4.PQRS

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a

1

b

2

c

3

d

4

answer is A.

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Detailed Solution

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I=dxa+bcosx

a+b=u;ab=v;a=μ+v2;b=μv2

I=dtu+vt2

For v=0,I=dtu=2tu+c=2utanx2+c

For v>0I=2vdtt2+u/v=2vvutan1tvu+c=2uvtan1tanx2vu+c

For v<0 I=2vdtuv+t2=2vv2uloguv+tuvt+c=1uvlogu+vtan(x/2)uvtan(x/2)+c

For v=-1

I=1ulogu+tan(x/2)utan(x/2)+c

 

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