Short term memory
Aug21-04, 04:47 PM
ok heres the problem i haven't taken trig for like 2 years and suddenly i have been thrown back in to it...
problem: 2 cos 2x - 4 cos x + 3 = 0 0 < x < 2 pi
my work (used cos 2 x = 2 cos^2 x - 1)
4 cos^2 x - 2 - 4 cos x + 3 = 0
4 cos^2 x - 4 cos x + 1 = 0
ok now here is my problem if i try and factor it out i ll be left with the a really ugly 1/ ( 4 cos x)
is there another equation i could use... is my logic flawed... is there an easier way... do i just have to do it the ugly way... ???
problem: 2 cos 2x - 4 cos x + 3 = 0 0 < x < 2 pi
my work (used cos 2 x = 2 cos^2 x - 1)
4 cos^2 x - 2 - 4 cos x + 3 = 0
4 cos^2 x - 4 cos x + 1 = 0
ok now here is my problem if i try and factor it out i ll be left with the a really ugly 1/ ( 4 cos x)
is there another equation i could use... is my logic flawed... is there an easier way... do i just have to do it the ugly way... ???