`int_0^1log(sqrt(1-x)+sqrt(1+x))dx` equals:

1.	`int_0^1log(sqrt(1-x)+sqrt(1+x))dx` equals:
Answer» Correct Answer - `(1)/(2)log1-(1)/(2)+(pi)/(4)` Let `I = int _(0)^(1) log (sqrt(1-x)+sqrt(1+x))dx` Put `x= cos 2 theta` `rArr dx =- 2 sin 2 theta d theta` ` :. =- 2 int _(pi//4)^(0) log [ sqrt(1-cos 2 theta)+sqrt(1+cos 2 theta)] (sin 2 theta) d theta` `=- int _(pi//4)^(0) log [ (sqrt(2) sin theta+ cos theta)]sin 2 theta d theta` ` =- 2 int _(pi//4)^(0) [ (log sqrt(2))sin 2 theta+ log (sin theta + cos theta ) * sin 2 theta ] d theta` `=- 2 log sqrt(2)[(-cos 2 theta )/(2)] _(pi//4)^(0)- 2 int _(pi//4)^(0) log underset(I) ((sin theta + cos theta))underset(II) (* sin 2 theta d theta)` ` = log sqrt(2)-2 [ - {log (sin theta + cos theta) * (cos 2 theta)/(2)}_(pi//4)^(0)- int_(pi//4)^(0) (( cos theta - sin theta)/(cos theta sin theta)xx(- cos 2 theta)/(2)) d theta]` `= log (sqrt(2)) -2 [ 0 + (1)/(2) int _(pi//4)^(0) ( cos theta - sin theta) ^(2)d theta]` `= (1)/(2) log 2 - int _(pi//4)^(0) (1- sin theta) d theta` `= (1)/(2) log 2 - [ theta + (cos 2 theta)/(2)]_(pi//4)^(0)` ` =(1)/(2) log 2 - ((1)/(2) - (pi)/(4))=(1)/(2)+(pi)/(4)`

Discussion

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))`