Answer :
Given : 
To show : 
Formula used : 
= 
= 
If u and v are functions of x,then 
= u
+ v
The CHAIN RULE states that the derivative of f(g(x)) is f’(g(x)).g’(x)
y = x + 
y2 = xy + 1
Differentiating with respect to x
= 
+ 0 (as differentiation of constant is zero )
2y.
= x.
+ y
= y
= 
= 
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