Lösung 4.4:2b
Aus Online Mathematik Brückenkurs 1
The equation \displaystyle \cos x= 1/2 has the solution \displaystyle x=\pi/3 in the first quadrant, and the symmetric solution \displaystyle x = 2\pi -\pi/3 = 5\pi/3 in the fourth quadrant.
If we add multiples of \displaystyle 2\pi to these two solutions, we obtain all the solutions
where n is an arbitrary integer.
