1.

Solve: (1 – x) dy – (1 + y) dx = 0

Answer»

(1 – x) dy – (1 + y) dx = 0 

Separating the variables, 

(1 – x)dy = (1 + y) dx 

dy/(1 + y) = dx/(1 - x)

Integrating, we get 

∫1/(1 + y)dy = ∫1/(1 - x)dx

log(y + 1) = -log(1 – x) + log c 

log(y + 1) + log(1 – x) = log c 

(y + 1) (1 – x) = c



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