If y = tan-1x, find 
in terms of y alone.
Given: y = tan-1x …(i)
⇒ tan y = x
On differentiating Eq. (i) with respect to x, we get
Now, again differentiating the above with respect to x, we get
64
If y = tan-1x, find in terms of y alone.
Given: y = tan-1x …(i)
⇒ tan y = x
On differentiating Eq. (i) with respect to x, we get
Now, again differentiating the above with respect to x, we get