Hi,

I'm having a lot of trouble answering this question it must be said, I've tried a number of approaches, mostly using the double angle formulae on sin4x and cos4x and then messing around with it to get it to look like something I can solve, but to no avail. Any help would be much appreciated! :)

Find the general solution to

$\displaystyle \sin 2x + \sin 4x = \cos 2x + \cos 4x$

Regards,

Stonehambey