How to solve a set of equations?

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tabw on 11 Sep 2014
Commented: tabw on 11 Sep 2014
[ cos(phi)*cos(theta), -sin(theta), -cos(theta)*sin(phi)]= 1
[ cos(phi)*sin(theta), cos(theta), -sin(phi)*sin(theta)]=0
[ sin(phi), 0, cos(phi)]=0
How to solve the phi and theta?
I tried A\B, it seems don't work.
tabw on 11 Sep 2014
Actually, I have a vector i,j,k. I want to multiply it with a rotational matrix to make the vector align with one of the three axis(x,y,z)

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