A) \[Cos\text{ }x\text{ }tan\text{ }y=c\]
B) \[cos\text{ }x\text{ }sin\text{ }y=c\]
C) \[{{e}^{\cos \,x}}\,\tan \,\frac{y}{2}=c\]
D) \[{{e}^{\cos \,x}}\,\tan \,y=c\]
Correct Answer: C
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