The solution of differential equation cos(x + y) dy = dx is given by 

1
\(y = x\sec \left( {\frac{y}{x}} \right) + c\)
2
\(y + {\cos ^{ - 1}}\left( {\frac{y}{x}} \right) = c\)
3
\(y = \tan \left( {\frac{{x + y}}{2}} \right) + c\)
4
\(y = \cot \left( {\frac{{x + y}}{2}} \right) + c\)

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