\TWOVECTORSANGLE(1,1)(0,1){\sol} $\sol$ radians \RADtoDEG{\sol}{\degsol} (or $\degsol$ degrees) \TWOVECTORSANGLE(1,0,0)(0,1,0){\sol} $\sol$ \RADtoDEG{\sol}{\degsol} (or $\degsol$ degrees)