# How to prove the following equation:cos*2(180+x)+tan(x-180)sin(720-x)cosx=cos2x

I have tried solving it but I just can't get it right

How to prove the following equation:cos*2(180+x)+tan(x-180)sin(720-x)cosx=cos2x

I have tried solving it but I just can't get it right

Asked: **
2017-04-13 08:12:09 -0600
**

Seen: **143 times**

Last updated: **Apr 13 '17**

Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.

What does

`cos*2(180+x)`

mean ?Let me guess:

`bool(equ)`

yields`True`

Well...

This is the half of the cake.