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Question

f(x)dx=ψ(x), then x5f(x3)dx is equal to

A
13[x3ψ(x3)x2ψ(x3)dx]+c
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B
13x3ψ(x3)x3ψ(x3)dx+c
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C
13x3ψ(x3)x2ψ(x3)dx+c
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D
13[x3ψ(x3)x3ψ(x3)dx]+c
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Solution

The correct option is C 13x3ψ(x3)x2ψ(x3)dx+c
Given, f(x)dx=ψ(x)
I=x5f(x3)dx
put x3=tx2dx=13dt
I=13tf(t)dx
=13[tf(t)dt(f(t)dt)dt]+c
=13[tψ(t)(f(t)dt)dt]+c
=13[x3ψ(x3)3x2ψ(x3)dx]+c
=13x3ψ(x3)x2ψ(x3)dx+c

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