Solve the equation:
\sqrt[3]{cos5x +2cosx} - \sqrt[3]{2cos5x+cosx}=2\sqrt[3]{cosx}.(cos4x-cos2x)
Sorry but i can't for they in because it appear[LaTeX ERROR: Compile failed]
You can see this question at another location where you posted it...
http://www.mymathforum.com/viewtopic.php?f=13&t=20513
Notice that neither MHF nor MMF wishes to do your work for you.