Mark (√) against the correct answer in each of the following:
To find: Value of 
Formula used:
We have, 
… (i)
Let x = tant , t = tan-1x
⇒ dx = sec2t dt
If tant = x ,
sec t = 1 + x 2
Taking 1st function as 
and second function as 
1
Mark (√) against the correct answer in each of the following:
To find: Value of
Formula used:
We have, … (i)
Let x = tant , t = tan-1x
⇒ dx = sec2t dt
If tant = x ,
sec t = 1 + x 2
Taking 1st function as and second function as