+44 cos (4pi/3) = cos (240°) = - cos (60°) = -1/2 how could i sketrch this
+226 Hi,
there is a website called desmos, desmos.com/calculator, a graphing calculator that will help you graph that problem.
+2446 Here is a sketch:
\(\frac{4\pi}{3}\) lies between \(\pi\) and \(\frac{3\pi}{2}\), so the terminal side lands in the third quadrant.
