Find 
, when
If 
and 
-1 < t < 1, prove that 
as 
Put t = tan 
= 2
x = 2(
) [since, t = sin
]
differentiating it with respect to t,
……(1)
Now ,
Put t = tan
= 2
[since t = tan
]
differentiating it with respect to t,
……(2)
Dividing equation (2) by (1),
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