Answer :
Given : Let u = 
and v = cos x
To differentiate : 
with respect to cos x
Formula used : 
= - sinx
The CHAIN RULE states that the derivative of f(g(x)) is f’(g(x)).g’(x)
Let u = 
and v = cos x
Differentiating u with respect to x
= 
= 
.
Differentiating v with respect to x
= 
= 
= 
= 
.
Ans. 
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