Im trying to find the angle between two vectors on Maple 13. I type in: "VectorAngle((3,7,7),(8,6,2))" and it gives me $\displaystyle arccos(\frac{20}{1391}\sqrt{107}\sqrt{26})$. This simplifies to .71 radians or about $\displaystyle 40^o$. The problem is the angle is supposed to be over 70 degrees from what I've worked out. Are my calculations wrong or did i type something in wrong in the calculator?

I'm not sure if this is important, but when i typed in my vectors I, instead of the inside parentheses in red above, used some strange symbols that looked like < and > but taller and skinnier, but i don't know how to type these i had just copy-pasted them from somewhere else. When i copy-paste them here, though, they show up as <>, but they don't look the same when i try to type them into Maple as <>. I just don't get this at all