Question: newb question: tan(a) doesn't appear to plot correctly

Hello,

Relatively new to Maple - just been playing about with basic trig. But when I try to plot a straightforward tan(a) I get something that's clearly not tan(a). sin and cos(a) behave as you'd expect. What am I doing wrong? It makes me worry about other plots I've suspected were wrong...

Thanks,

Dan

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