# Differential Equation

#### sinichko

$$\displaystyle y''+y=\frac{1}{\sqrt{cos2x}}$$

#### dwsmith

MHF Hall of Honor
$$\displaystyle y''+y=\frac{1}{\sqrt{cos2x}}$$
Is there a specific method you are supposed to use?

#### sinichko

yes, linear equations with constant coefficients

#### dwsmith

MHF Hall of Honor
yes, linear equations with constant coefficients
Have you solved the complement equation?