(i+j+k)^2=i^2+j^2+k^2+2ik+2jk+2Ij=1+1+1+2*1*1*cos60+2*1*1*cos60+2*1*1*cos90=5
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(i+j+k)^2=i^2+j^2+k^2+2ik+2jk+2Ij=1+1+1+2*1*1*cos60+2*1*1*cos60+2*1*1*cos90=5