Question

If 2`cos^2x` - `cosx` = 1 , what is the value of `x`?

Answer 1

`x=0`

Explanation:

As we know:

`cos 0 =1`

Put `x=0` in equation:

`2cos^(2)0-cos0=1`

`2*1-1=1`

`1=1`

`L.H.S=R.H.S`