- #1

Froskoy

- 27

- 0

## Homework Statement

[tex]\sin\theta\frac{d^2y}{d\theta^2}-\cos\theta\frac{dy}{d\theta}+2y\sin^3\theta=0[/tex]

## Homework Equations

Use the substitution [itex]x=\cos\theta[/itex]

## The Attempt at a Solution

I started off by listing:

[tex]

x=\cos\theta\\

\frac{dx}{d\theta}=-\sin\theta\\

\frac{d^2x}{d\theta^2}=-\cos\theta\\

[/tex]

But don't know whether this helps, or where to go next. Could someone please give me a hint at how to approach this, I'd prefer not to have a full solution, but really am desperate for a starting point!

With very many thanks,

Froskoy.