- #1

hms.tech

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## Homework Statement

Prove that :

[itex]\frac{cos(x)-1}{(1-cos(x))^{3}}[/itex] =

**-**[itex]\frac{1}{4sin^{4}(0.5x)}[/itex]

## Homework Equations

None that I can think of.

Maybe the double angle formula...

## The Attempt at a Solution

I couldn't do much in this question :

**-**[itex]\frac{1}{(1-cos(x))^{2}}[/itex]