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Question

(6x5)23x25x+6dx=

A
123x25x+6+c
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B
3x25x+6+c
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C
123x25x+6+c
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D
133x25x+6+c
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Solution

The correct option is D 3x25x+6+c
Consider, I=(6x5)dx23x25x+6
N(x)=6x5
D(x)=3x25x+6
N(x)=D(x)
So, 12N(x)D(x).dx=12D1(x).dxD(x)
=12d(D(x))D(x)
=12×2D(x)+c
=D(x)+c
D(x)=3x25x+6
So,
I=3x25x+6+c
Hence, (6x5)23x25x+6.dx=3x25x+6+c

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