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Original Message (ID '84991') By Bill Simpson:
Substitute Sin and Cos for sin and cos and let Mathematica know you are only using Real values. In[1]:= t=pi/2;p=0;k={Sin[t]*Cos[p],Sin[t]*Sin[p],Cos[t]};oP={x,y,z}; Assuming[Element[{t,x,y,z},Reals], Simplify[Norm[k]] ] Out[5]= 1 In[6]:= Assuming[Element[{t,x,y,z},Reals], Simplify[Norm[oP]] ] Out[6]= Sqrt[x^2 + y^2 + z^2]