Solve:
for
0 < x < 2pi
I thought the way I did it was right but I get the wrong answer.
so I factored
cosx(4cosx)=3
so
cosx=3 and 4cosx=3
cosx cannot =3 so 4cosx=3 ....
cosx=3/4
so I sketch a little graph and find x=pi/6 and 15 pi/8? but this gets confusing. whats the right way to find this?
but that isnt right, could someone help me with this question?
thanks.