# Verify that y = e x 3 5 cos ( 2 x ) 6 5 sin ( 2 x ) is a solution of the differential...

## Question:

Verify that {eq}\displaystyle y = e^{-x} - \frac{3}{5} \cos(2x) - \frac{6}{5} \sin(2x){/eq} is a solution of the differential equation {eq}\displaystyle \frac{dy}{dx} + y = -3 \cos(2x){/eq}.

## Differential Equation:

A differential equation is an equation between a specified derivative on an unknown function, its values, and unknown quantities and functions. Many physical laws are most simply and naturally formulated as a differential equation. Ordinary differential equations are whose unknown functions are the function of a single variable.