Question

The general solution of the equation cos(2x)=1 is

Answer 1

Given that cos (2x) = 1, the inverse is also true: arccos 1 = 2x ("The angle whose cosine equals 1 is 2x". You could solve this equation for x. Try it.

2x = ?

so x = ?

Answer 2

x=1/2 ?

Answer 3

The equation you're starting from is arccos 1=2x. We cannot just forget about the "arccos" operator. It has to show up in your result as you solve for x.

If 2x=arccos 1, divide both sides by 2. Your result?

Answer 4

x=?