`int_(1)^(oo)(dx)/(x(1+x))`

int_(1)^(oo)(dx)/(x^(2))

36.Find the following integrals iii) int_(1)^(oo)(dx)/(x^(1.4)) v) int_(-5)^(-2)(1)/(1-x)dx vil int_(0)^(1)(a+bx)^(2)dx

int_(0)^(oo)(dx)/((1+x^(2))^(4))=

I=int_(0)^(oo)(dx)/(1+e^(x))

The value of definite integral int _(0)^(oo) (dx )/((1+ x^(9)) (1+ x^(2))) equal to:

int_(1)^( oo)(1)/(x)dx=

The value of int_(0)^(oo)(dx)/(1+x^(4)) is (a) same as that of int_(0)^(oo)(x^(2)+1dx)/(1+x) (b) (pi)/(2sqrt(2))( c) same as that of int_(0)^(oo)(x^(2)+1dx)/(1+x^(4))(d)(pi)/(sqrt(2))

If int_(0)^(b)(dx)/(1+x^(2))=int_(b)^( oo)(dx)/(1+x^(2)) , then b=

int_(0)^(oo)(dx)/((1+x)sqrt(x))