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Question

Solve :
I=5x2x2+4dx

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Solution

I=5x2x2+4dx
=5xx2+4dx2x2+4dx
I=AB
(A)
5xx2+4dx
x2+4=t
2xdx=dt
52dtt
52ln|t|+c
52ln|x2+4|+c
(B)
2x2+4dx
(dxx2+a2)=1atan1(xa)
22x2+(2)2
2×12tan1(x2)+p
tan1(x2)+p
I=AB
I=52ln|x2+4|+ctan1(x2)+p
52ln|x2+4|tan1(x2)+k

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