1.

The integral `int_(2)(4)(logx^(2))/(logx^(2)+log(36-12x+x^(2))) dx` is equal toA. `2`B. `4`C. `1`D. `6`

Answer» Correct Answer - C
`I=int_(2)^(4)(logx^(2))/(logx^(2)+log(36-12x+x^(2))dx`
`I=2/2 int_(2)^(4)(log|x|)/(log|x|+log||6-x|)dx` ……….i
`I=int_(2)^(4)(log|6-x|)/(log|6-x|+log|x|) dx{int_(a)^(b)f(x)dx=int_(1)^(b)f(a+b-x)dx}` ……ii
Adding i and ii
`2I=int_(2)^(4)(log|x|+log|6-x|)/(log|x|+log|6-x|)dx=int_(2)^(4)dx=2`
Hence `I=1`


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