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![vector(x,y,z)=vector(cos([2*t]),sin([2*t]),2*t)](formula1.png)
![vector(x,y,z)=vector(2*u*cos([n])*cos([v])+u*sqrt(2)*sin([n])*sin([v])-cos([n]),2*u*sin([n])*cos([v])+[-(sqrt(2)*cos([n]))]*sin([v])*u-sin([n]),n-(u*sqrt(2)*sin([v])))](formula2.png)
![vector(x,y,z)=vector(2*cos([n*u])*cos([v])+sqrt(2)*sin([n*u])*sin([v])-cos([n*u]),2*sin([n*u])*cos([v])+[-(sqrt(2)*cos([n*u]))]*sin([v])-sin([n*u]),n*u-(sqrt(2)*sin(v)))](formula3.png)
