Solve #cos^3x=cosx#?
#Cos^3x=cosx# I get got the #0, pi/2, pi# but I cant get #(3pi)/2# . If anyone can help out I would really appreciate it.
2 Answers
Feb 10, 2018
See below
Explanation:
It's a little tricky, but try setting the equation = 0
Now factor out
And now factor the difference of two squares
Set each factor equal to 0 and solve using your unit circle
1)
2)
3)
Feb 11, 2018
See below.
Explanation:
Pythagorean identity: