differentiation

Question: If $\sin y = x\cos (a + y),$ then $\frac{{dy}}{{dx}} = $

1) $\frac{{{{\cos }^2}(a + y)}}{{\cos a}}$

2) $\frac{{\cos (a + y)}}{{{{\cos }^2}a}}$

3) $\frac{{{{\sin }^2}(a + y)}}{{\sin a}}$

4) None of these

Solution:

Explanation: Explanation

Implicit-function

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