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y' + 2xy = 0........faktor integrasi: e^∫2x dx
e^(x²)
y.e^(x²) = c₁
y = c₁/e^(x²)
y = c₁.e^(-x²)
1c. (x²+1).y' + y² + 1 = 0
(1/(y²+1)) dy = -(1/(x²+1)) dx
arctan (y) = -(arctan (x)+c₁)
y = -tan (arctan (x)+c₁)