# 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 -0500
**

Seen: **34 times**

Last updated: **Apr 13**

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What does

`cos*2(180+x)`

mean ?Let me guess:

`bool(equ)`

yields`True`

Well...

This is the half of the cake.