defence exam Coast Guard Navik GD (General Duty) 02/2025 Mock Test Series Mathematics Differential Equations Solution of Differential Equations
The solution of the differential equation \(\rm\frac{dy}{dx}=\frac{1+y^2}{1+x^2}\) is:
1
y = tan–1x
2
y – x = k (1 + xy)
3
x = tan–1y
4
tan (xy) = k