1.

Find the general solution of the following differential equation:cos x(1 + cos y)dx – sin y(1 + sin x)dy = 0

Answer»

Given: 

cosx(1 + cos y)dx - sin y(1 + sin x)dy = 0 

Dividing the whole equation by (1 + sin x)(1 + cos y), we get,

⇒ \(\frac{\int{cosx\,dx}}{1+sin\,x}\) = \(\frac{\int{cosy\,dy}}{1+sin\,y}\)

⇒ log| 1 + sin x | + log|1 + cos y| = log c 

⇒ (1 + sin x)(1 + cos y) = c



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