Solution of Differential Equation \(\frac{dy}{dx} = sec(x+y) \) is :

1
y - \(\tan\frac{1}{2}(x-y) \) = c
2
y + \(\tan\frac{1}{2}(x-y) \) = c
3
y - \(\tan\frac{1}{2}(x+y) \) = c
4
y + \(\tan\frac{1}{2}(x+y) \) = c

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