Question:
Mark $(\sqrt{ })$ against the correct answer in the following:
If $(x+y)=\sin (x+y)$ then $\frac{d y}{d x}=?$
A. -1
B. 1
C. $\frac{1-\cos (x+y)}{\cos ^{2}(x+y)}$
D. none of these
Solution:
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