find all solutions cosx

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The above answer is incomplete. The domain of `cos^(-1)` is `(0,pi)` so `cos^(-1)(1/2)=pi/3` as stated. But the cosine has value 1/2 at `(5pi)/3` as well.So the complete solution is `x=pi/3+2npi,x=(5pi)/3+2npi` for `n in ZZ`

find all solutions cosx

The solutions of 2*cos x – 1 = 0 have to be determined.2*cos x – 1 = 0=> 2*cos x = 1=> `cos x = 1/2`=> x = `cos^-1(1/2)`=> x = `pi/3 + 2*n*pi`The solution of 2*cos x – 1 = 0 is `pi/3 + 2*n*pi`