# Order 3

1. Nov 26, 2008

### preekap

Explain differential equation of order 3? With example?

2. Nov 26, 2008

### HallsofIvy

Staff Emeritus
A differential equation of order three is an equation with an unknown function that involves the third derivative of that function.

Examples:

$$\frac{d^3y}{dx^3}= 0[/itex] where y is an unknown function of x. [tex]y^2\frac{d^3y}{dt^3}- 7y\frac{d^2y}{dt^2}+ sin(y)\frac{dy}{dt}+ e^{ty}= ln(t)$$
where y is an unknown function of t.