How do you solve #f(x)=3-4cos2x#?
1 Answer
Aug 12, 2015
Solve f(x) = 3 - 4cos 2x
Explanation:
3 - 4cos 2x = 0 --> cos 2x = 3/4 = 0.75
Calculator gives -->
Check
x = 20.70 --> 2x = 41.41 -->cos 2x = 0.75
3 - 4(0.75) = 0 OK
