Himpunan penyelesaian dari cos2x=cosπ2\cos2x=\cos\frac{\pi}{2}cos2x=cos2π untuk 0≤x≤2π0\le x\le2\pi0≤x≤2π adalah ....
{π2,35π,74π}\left\{\frac{\pi}{2},\frac{3}{5}\pi,\frac{7}{4}\pi\right\}{2π,53π,47π}
{π2,34π,58π,74π}\left\{\frac{\pi}{2},\frac{3}{4}\pi,\frac{5}{8}\pi,\frac{7}{4}\pi\right\}{2π,43π,85π,47π}
{π4,32π,54π}\left\{\frac{\pi}{4},\frac{3}{2}\pi,\frac{5}{4}\pi\right\}{4π,23π,45π}
{π4,34π,54π,74π}\left\{\frac{\pi}{4},\frac{3}{4}\pi,\frac{5}{4}\pi,\frac{7}{4}\pi\right\}{4π,43π,45π,47π}
{π2,35π,54π}\left\{\frac{\pi}{2},\frac{3}{5}\pi,\frac{5}{4}\pi\right\}{2π,53π,45π}