−cos(2π(x+1)/2)+1+(−cos(2π(x+1)/3)+1)(−cos(2π(x+2)/3)+1)+(−cos(2π(x+1)/5)+1)(−cos(2π(x+2)/5)+1)(−cos(2π(x+3)/5)+1)(−cos(2π(x+4)/5)+1)=0 for x