December 26th, 2018, 12:41 PM  #11 
Math Team Joined: May 2013 From: The Astral plane Posts: 2,194 Thanks: 897 Math Focus: Wibbly wobbly timeywimey stuff.  
December 26th, 2018, 03:36 PM  #12  
Math Team Joined: Jul 2011 From: Texas Posts: 2,941 Thanks: 1545  Quote:
(3) If u and v are both unit vectors inclined at 60° ... d = 3a + 2b + c = 10u + 5v d = $5\sqrt{7}$  
December 27th, 2018, 06:44 AM  #13 
Senior Member Joined: Sep 2016 From: USA Posts: 619 Thanks: 391 Math Focus: Dynamical systems, analytic function theory, numerics 
So you have so little understanding of what you are doing that you can't even parse the simple questions you have been asked here? I suggest you spend more time reading and stop trying to shortcut through your homework or the next course is going to kill you.

December 27th, 2018, 05:03 PM  #14 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,821 Thanks: 643 Math Focus: Yet to find out.  

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