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Q)

Solution of the general equation : $\large\frac{dy}{dx}$$=\cos (x+y) - \sin (x+y) $

$(a)\;\log (1- \tan (\frac{x+y}{2}))+x=c \\ (b)\;\log (1+\tan (\frac{x+y}{2}))+x=c \\ (c)\;\log (1+\tan (\frac{x+y}{2}))-x=c \\ (d)\;\log (1- \tan (\frac{x+y}{2}))-x=c $

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