plot r %3D max%280.4%2B0.3 cos%281.313%2B7 %CE%B8%2B0.5 * sin%2819 %CE%B8%29%29%2C 0.7 - 0.3 sin%282.473 %2B 3 %CE%B8 - sin%287 %CE%B8%29%29%29