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Q.

If ∫dx1+x+13=32(x+1)2/3−3(x+1)1/3+f(x)+C then f(x) is equal to

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a

log⁡|1+x+13|

b

3log⁡|1+x+13|

c

23log⁡|1+x+13|

d

13log⁡|1+x+13|

answer is B.

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Detailed Solution

Put x+1=t3, we have∫dx1+x+13=∫3t2dt1+t=3∫t−1+11+tdt=3t22−t+log⁡|1+t|+C=32(x+1)2/3−3(x+1)1/3+3log⁡|1+x+13|+C
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If ∫dx1+x+13=32(x+1)2/3−3(x+1)1/3+f(x)+C then f(x) is equal to