`int_0^oo(dx)/([x+sqrt(x^2+1)]^3)i se q u a lto``3/8`(b) `1/8`(c) `-3/8`(d) none of theseA. `3/8`B. `1/8`C. `-3/8`D. none of these

`int_0^oo(dx)/([x+sqrt(x^2+1)]^3)i se q u a lto``3/8`(b) `1/8`(c) `-3/

1.	`int_0^oo(dx)/([x+sqrt(x^2+1)]^3)i se q u a lto``3/8`(b) `1/8`(c) `-3/8`(d) none of theseA. `3/8`B. `1/8`C. `-3/8`D. none of these
Answer» Correct Answer - A Putting `x=tan theta` we get , `int_(0)^(pi//2) (dx)/([x+sqrt(x^(2)+1]^(3)))=int_(0)^(pi/2) (sec^(2) theta d theta)/((tan theta +sec theta)^(3))` `=int_(0)^(pi//2) (cos theta)/((1+sin theta)^(3))d theta` `=[-1/(2(1+sin theta)^(2))]_(0)^(pi//2)=-1/8+1/2=3/8`

Consider the integral `I=int_(0)^(2pi)(dx)/(5-2cosx)` Making the substitution `"tan"1/2x=t`, we have `I=int_(0)^(2pi)(dx)/(5-2cosx)=int_(0)^(0)(2dt)/((1+t^(2))[5-2(1-t^(2))//(1+t^(2))])=0` The result is obviously wrong, since the integrand is positive and consequently the integral of this function cannot be equal to zero. Find the mistake.
The area bounded by the curves `y=cosx` and `y=sinx` between the ordinates `x=0` and `x=(3pi)/2` isA. `4sqrt(2) + 2`B. `4sqrt(2) +1`C. `4sqrt(2) + 1`D. `4sqrt(2) - 2`
Obtain the area enclosed by region bounded by the curves `y = x ln x` and ` y = 2x-2x^(2)`.A. `7//6`B. `7//24`C. `12//7`D. `7//12`
If `I_n=int_0^pi e^x(sinx)^n dx ,` then `(I_3)/(I_1)` is equal toA. `3//5`B. `1//5`C. `1`D. `2//5`
Prove that:`I_n=int_0^oox^(2n+1)e^-x^2dx=(n !)/2,n in Ndot`
If f(x) is continuous and `int_(0)^(9)f(x)dx=4`, then the value of the integral `int_(0)^(3)x.f(x^(2))dx` isA. 2B. 18C. 16D. 4
`lim_(trarr0) int_(0)^(2pi)(|sin(x+t)-sinx|)/(|t|)dx` equalsA. 2B. 4C. 43469D. 1
Given that `lim_(nrarroo) sum_(r=1)^(n) (log_(e)(n^(2)+r^(2))-2log_(e)n)/n = log_(e)2+pi/2-2`, then evaluate : ` lim_(nrarroo) (1)/(n^(2m))[(n^(2)+1^(2))^(m)(n^(2)+2^(2))^(m) "......"(2n^(2))^(m)]^(1//n)`.
`lim_(nrarroo) sum_(r=0)^(n-1) (1)/(sqrt(n^(2)-r^(2)))`
`lim_(nrarroo) (((n+1)(n+2)"........"3n)/(n^(2n)))^(1//n)` is equal to :A. `(27)/(e^(2))`B. `(9)/(e^(2))`C. `3 log3-2`D. `(18)/(e^(4))`