Maybe:

sage:def R_theta(theta):
   return matrix(SR,[[cos(theta),sin(theta),0],[-sin(theta),cos(theta),
0],[0,0,1]])
sage: R_theta(x)
[ cos(x)  sin(x)       0]
[-sin(x)  cos(x)       0]
[      0       0       1]
sage: R_theta(1)
[ cos(1)  sin(1)       0]
[-sin(1)  cos(1)       0]
[      0       0       1]
sage: R_theta
<function R_theta at 0x5e83848>

Andrzej Chrzeszczyk

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