1) 2xy(y')² + 3xyy' + xy = 0.
2) 2x²(y')² + xyy' - 3y² = 0.
3) x(y')² + (x² - 2√x)y' + 1 - x(3/2) = 0.
4) (y')² - 4x²y' + 4x⁴ - x² = 0.
Solve the following differential equation