tentukan nilai limit x mendekati 0 cos 2 x - cos 4x/1 - cos 6x

Dik lim x-->0 cos2x- cos 4x/1-cos 6x
Jb.
Lim x--> 0 cos 2x-cos 4x- cos 6x
Cos 2 (0)-cos 4 (0)-cos 6 (0)
=Cos 0- cos 0- cos 0
= 1- 1- 1
=1-2
= -1