A) \[\frac{{{\cos }^{2}}(a+y)}{\cos a}\]
B) \[\frac{\cos (a+y)}{{{\cos }^{2}}a}\]
C) \[\frac{{{\sin }^{2}}(a+y)}{\sin a}\]
D) None of these
Correct Answer: A
Solution :
\[x=\frac{\sin y}{\cos (a+y)}\]. Find \[\frac{dx}{dy}\]and then\[\frac{dy}{dx}\].
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