Tan 660'
is that 660 minutes?
If so, 660' = 11°
If you meant 660°, then since 660 = 360+300,
tan660° = tan300°
Now, since 300 = 360-60,
tan660° = -tan60°
If so, 660' = 11°
If you meant 660°, then since 660 = 360+300,
tan660° = tan300°
Now, since 300 = 360-60,
tan660° = -tan60°