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Draw e+f, and solve for the angle.

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Ok, sometimes people get stuck but don't speak up until you ask :(

why am I finding the theta between e & e+f....theta=e dot e+f / sqrt(3/2)...

You need theta between e and f.|dw:1335665267401:dw|

but then theta=e dot f what is that...

Where is e+f on the picture? You have a triangle and you know the length of all 3 sides.

|dw:1335665495008:dw|

got it got it got it....

thanks!!!

ok, that saves me some drawing :)

I'm probably not :)

Actually for any m and n
|| m e - n f|| can be calculated and depends only on m and n and e.f

awesome eliassaab!!!

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